I believe they were metal caps John. I found some on ebay. Search for item number. 257362347893. Chevs of the 40s sells repops as does The Filling Station.

@john-schildberg John, I might have some. I will gladly send you set, if we can determine that they are the correct ones. 

Mike

Thanks Mike, as Tiny said they might be metal.   I would need 5 of them if you have them.

@john-schildberg  John, These are the ones I have. I was able to find the original stamping dies that Chevrolet used to produce these in the 1930s. I found a German company that does subcontract work for Mercedes Benz and made a deal with them to stamp the caps. The plating is done in Switzerland by a firm that mostly does work for watchmakers. The final product speaks for itself. No wait, I remember now, I bought a bag of them on eBay. Send me your address.

Mike

I must have found the same guy on EBay, I got a bag of them as well.

@35mike

Mike, thank you for looking for the caps.  How much do you want for them?    John Schildberg   103 NW 6th St.  Greenfield Iowa 50849.

@dunfire Thank you Patrick, for your reply.  I think Mike is sending the caps.   If not, I will contact you.

@john-schildberg John, No charge. I think I have a padded envelope that I can recycle. I will be headed to the Post Office sometime this week.

Mike

Great Mike.  I can at least pay you for the postage 

@35mike 

You really had me with the "original stamping dies" and the Swiss plating company! 🤣 

@john-schildberg John, They are on the way. Tracking number 9500 1121 2171 6231 0915 87

Mike

Thanks Mike, I will let you know when they get here

Mike, they got here today.  They look great.   I'm sending you a check to cover the postage.  Thank you very much!

@john-schildberg You are welcome.

Mike