My '69 Z was equipped with them when I bought it, as was my Z11. I have both the sets, plus several NOS sets and refills I have bought over the years. I can share any numbers and features that you want to compare - I can dredge them out this weekend. I know the blade holders have patent info on them, possibly a date code, as do the inserts. Love those Red Dots -
I asked about originality many years back from a well known Chevrolet guy - he told me in no uncertain terms that some Camaros were equipped with them (from GM), particularly Z's and SS cars. I wouldn't mind hearing opinions from our internal experts -