72 kmembers

[W1AAR]

I have noticed that for TransAm cars... and others, the K member has a part number of 3583052 and therefore, 52 on the coin.  But when i check certain cars, I have also noticed some came with a 72 Coin which I can't find in the parts book>  Does anyone know wnat or where this 72 K member would come from?
Thanks very much e-bodies.org

[anlauto]

Sure it's not "77" ?

[W1AAR]

Yes, not 77.  That's what I first thought but I have seen that 340-6 power steering cars seem to come with 052 but a couple of cars with non-power steering have the 72 coin and I'm sure the cars are original.  Either way, I can't find any reference to a72 coin, curious.