If it is the same as Zeiss 50 mm lenses Nobby Sparrow on eBay has nice metal caps that are a close match for the post war Zeiss caps. Zeissman, also on eBay has serviceable plastic caps for less money. I have and use both of these and they do a good job of protecting the rear element on Contax RF lenses.
I've picked up some 3D printed rear caps for Contax lenses over the last year from simonforsterphotographic.co.uk that do the job well. Really nice and tight fit.
Or, if you want to message me with a mailing address, I'd be happy to print a couple for you and drop 'em in the mail, gratis. They work fine on my S mount lenses.
Thanks all for the suggestions and for your offer FloridaGoastPhoto. I may need a lens cap for a YashicaMat also so will order both from simonforsterphotographic
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