I asked David Siltman and he thinks it was in about 71/72 when the R caps were introduced. If you need some Sam, I have a mint set of 4 here I think?
Most people will add the non R caps to achieve to period look of 69 to 70 even with later dated wheels as long as the hoops and spoke designs are the right round looking ones.
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I like solid lifter cars, big cams and cars w/ 3 pedals in them. 
Last edited by NorCam; 03-30-2020 at 12:53 AM.
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