Thanks for the replies. Talked to body shop guy who said that the car makers may have screwed up and put the wrong emblem on the back bumper, has anyone heard of this? Also still looking for info on RPO's Willie had some for me.

the codes are:1AY YA7 AO1 E7Z

I would say that a much more likely scenario is that somebody had an accident and put a used bumper on with the wrong badge.

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Check the other topic. I replied to it and yes, I have seen that happen before.

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87 IROC 350 TPI with less than 10k original miles
93 Z28 Pace Car #494 of 645
86 Olds 442 (All Original)
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1AY = Dealer Stock order.