Hi all, just joined and have had this question/clarification for years. My 1970 Cuda 383 4sp with factory air was a special order car (Y39). Not sure how many 4spds with air were made (another question). Anyway it has radio option code R21 which is am/fm solid state radio. Nothing really clearly shows what radio this really is for 1970 and websites only call out thumbwheel for am/fm 1970 cars but the R35 option (which I think is not solid state?). I did (finally) see a another 70 Cuda for sale that has the R21 option that shows a radio installed that as an am/fm with the two knobs on the LH side which per websites is only slated for 71-74. Is it possible mine being special order or maybe late model it did come with am/fm but with knobs on LH side? See fender tag photo. Lots of options.Thanks for any help!!