Genuine Mazda Quarterlight Frame & Door Glass Guide – LH • N173-59-6AX

Genuine Mazda Quarterlight Frame & Door Glass Guide – Left Hand

Replacement Genuine Mazda left-hand quarterlight frame and door-glass guide for all Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models, including soft-top and Power Retractable Hard Top / Roadster Coupe variants.

This rigid frame is fitted at the front of the left-hand door and surrounds the fixed quarterlight glass. It also supports the guide channel used by the front edge of the moving door glass.

The frame helps maintain the correct position of the quarterlight glass and provides a stable guiding structure for the main door window. Corrosion commonly develops around the exposed upper section of the original frame, causing rust, paint bubbling or deterioration above the door.

One left-hand frame is fitted per vehicle, and this listing supplies one Genuine Mazda component. The corresponding right-hand frame is supplied separately under Mazda reference N173-58-6AX.

Side identification: Left hand refers to the vehicle’s left side when seated in the vehicle facing forwards. On a UK right-hand-drive MX-5, this is the nearside or passenger side.

Component distinction: This listing is for the rigid quarterlight frame and glass-guide assembly. It is not the separate moulded rubber glass-run channel, Mazda reference NE51-59-605D.

• Part type: Quarterlight frame and door-glass guide
• Common names: Quarterlight frame / vent-window frame / door-window guide frame
• Mazda catalogue description: Mould (L), Glass Guide-Vent
• Alternative Mazda description: Guide A (L), Glass
• Fitting position: Front left door
• UK position: Nearside / passenger side
• Installation location: Around the fixed front quarterlight glass
• Function: Supports the quarterlight and guides the front edge of the moving door glass
• Quantity fitted per vehicle: 1 left-hand frame
• Quantity supplied: 1 frame / guide assembly
• Right-hand frame included: No
• Matching right-hand reference: N173-58-6AX
• Separate rubber glass-run channel included: Confirm from supplied packaging
• Door glass included: No
• Fixed quarterlight glass included: Confirm from supplied packaging
• Window regulator included: No
• Door trim or mounting hardware included: Confirm from supplied packaging
• Brand: Genuine Mazda
• Part No.: N173-59-6AX
• Previous Mazda references: NE51-59-601, NE51-59-601B and NE51-59-601C
• MX-5 fitment: Mk3, Mk3.5 and Mk3.75 NC

Typical reasons for replacement:

• Rust or corrosion on the exposed frame
• Paint bubbling above the door
• Frame bent, distorted or impact damaged
• Quarterlight glass loose within the frame
• Door glass binding or moving incorrectly
• Excessive movement or rattling from the side window
• Wind noise around the front edge of the door glass
• Water ingress around the quarterlight area
• Original assembly damaged during door or glass repairs
• Door being restored or refinished

Fitment advice: N173-59-6AX is the left-hand frame and guide assembly. It should not be confused with the left-hand rubber window channel NE51-59-605D, the door waist seals or the main roof-to-window weatherstrips.

Replacement advice: Inspect the quarterlight glass, surrounding rubber channel, moving door glass, regulator and guide mechanism before installation. A replacement frame will not correct a worn regulator or incorrectly adjusted door glass.

Corrosion inspection: Check the door shell and the frame mounting points for trapped moisture, corrosion or damaged paint. Treat any exposed metal before installing the replacement assembly.

Glass-alignment advice: Record the original frame and door-glass adjustment before dismantling. The moving glass must enter the guide smoothly and seal evenly against the surrounding roof and door weatherstrips.

Seal inspection: Inspect the separate glass-run channel and adjacent weatherstrips for hardening, splitting or distortion. Reusing a damaged channel can cause poor sealing or excessive friction against the glass.

Other items to inspect: Check the window regulator, door-glass mounting points, inner and outer waist seals, quarterlight glass, door weatherstrip and roof-to-window seals while the door is dismantled.

Useful tools / consumables: Plastic trim tools, screwdrivers, small socket set, masking tape, glass-safe cleaner, rubber-compatible lubricant, suitable corrosion protection and replacement door-trim clips where required.

Difficulty guide: DIY Difficulty: Moderate to Advanced. Installation requires removal of the interior door trim and partial dismantling and adjustment of the door-glass and quarterlight assemblies.

Why Genuine Mazda? Genuine Mazda quarterlight frames match the original door mounting points, glass-guide profile, frame shape and surrounding trim geometry. Correct alignment is important for smooth window operation and an effective seal against wind and water.

What’s in the box: One Genuine Mazda left-hand quarterlight frame and door-glass guide assembly, part number N173-59-6AX.

Installation notes: Lower the door glass and remove the interior door trim and associated components as required. Mark the original glass and frame adjustment positions before dismantling. Remove the original quarterlight assembly carefully and inspect the door mounting points for corrosion or damage. Transfer or replace the quarterlight glass and rubber channel as required, then install the new frame without twisting or distorting it. Adjust the moving door glass so that it travels freely and seals evenly before refitting the door trim.