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Hello,
Those tips were available from 1970 -1973.
The 1968 and 1969 tips were round.
The 1970 to 1972 tips should be interchangeable. The tips for 1973 use a different angle on the extension tube. I think that is due to the muffler difference on the 1973 model. In some catalogs you will see that if you are ordering for a 1973, they say to use the 1972 muffler and the 1972 exhaust extension as a compatible fit.
I bought a set of reproductions from a supporting catalog company. They are not as nice as the originals. The originals were made from a heavier, thicker type of metal. The reproductions were around $50 per set, but are very thin metal.
I just posted photos to a previous thread titled "MUFFLERS" Check that one out for additional informaiton.