This black plastic swingarm / chain case inspection hole cap fits:

Fits undetermined vintage Honda motorcycles

This genuine part has been separated from its idnetifying part #

Please use the follwing details and photos to determine application to your particular model

Overall diameter 1 1/2"

Appears to fit in 1 1/4" inspection hole

Made of black palstic

Some very mild storage shuffle scratches

Please view photos for visual identification 

If you rebuild or restore any type of vehicle you know how important it is to use genuine / original factory / or high quality aftermarket parts. A repair or restoration project is intended to return that motorcycle to as close to original as possible, all the way down to last nut, bolt, cotter pin, cable or inspection cap.

If there's even a chance you'll need this/these replacement part(s) in the future you'd better get them NOW!. Keep this in mind,  replacement parts are always good to have. When you decide to sell your vintage or classic motorcycle, including a few extra replacement parts always sweetens the deal for both buyer and seller.