Push Pull valve stem cover

[MCHinson]

I am getting ready for Hershey and I am trying to figure out what, if any car, some valve stem covers that I have are correct for. I have six of them, so I think they might be appropriate for a Dual Side Mount car of the 20's or 30's. They are larger than the valve stem covers for my Model A Ford, so I am guessing they would be for a substantially larger car of that era. They are approximately 1 inch diameter at the base and they are approximately 3 inches tall. They are labeled "Push Pull" and "Pat Pend" on the top. The push-pull feature allows you to extend them from about 3 inches or collapse them to about 2.75 inches in length. Anybody got any idea about what car these might fit?