I am looking for a set of valve spring retainers for a 1931 Oldsmobile. Its an F31 5 window coupe.

Thanks.

 

You might check with this guy. He's a couple hours from me but been selling vintage car parts for quite a while.

Antique Auto Parts Galore! - auto parts - by owner - vehicle... (craigslist.org)

 

To help widen your search I can give you the following information from the 1941 Oldsmobile Master Parts List ,
Part # 396117, cup, valve spring retaining it fits F29 thru 33, as well as V29 & 30 (Viking ) and L 32 thru early 34 to engine L 19020

 

Thanks