This used carburetor top cap fits:

 1983-1984 Honda XL600R

1983-1984 Honda XR500R

This used part is in good condition showing normal wear and tear

If you rebuild or restore any type of machine you know how important it is to use genuine / original factory parts when possible. A repair or restoration is intended to return that project to as close to original as possible, right down to the carburetor top 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 Honda, including a few extra replacement parts always sweetens the deal for both buyer and seller.