This eBay listing is for 1 used Olds Cap.  Part number may be 416393 

Decent shape for this cap.  Note, the retainer rattles I have not tried to tighten

Please view all pics and please read this entire listing before purchasing. 

I think it fits a 1972 to 1988?

Actual item you will receive is pictured. 

Condition is used.  Pitting.  Marks.  

Bolts could be stripped, not sure.  May have to adjust tabs

You should be able to get it to shine a little more.

Cap will ship fast