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Just polled a few owners of 63 Chevy II's built in Oakland. Seems they all had 4 digit numbers at the end of the ACC line, and all different. One owner said the dealer had the number from his car as the stock# on the sales agreement. It also seems transmission code M35 was the only actual RPO code they used on the cowl tag. All the rest are single letter codes. It may be of interest that Canadian built Chevy II's had the actual RPO codes on the cowl tag, sometimes including the engine. The ACC line on my L79 read M20L79A81. The A81 was the rare, bucket seat headrest option.
Bob
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here is the tag on my Oakland built 63 super sport factory Air car.....and it does not show a/c on the cowl tag....i purchase this car from the original owner in 1989 so i know it's indeed factory a/c.its a irmine white car originaly.much of the car is still original..
back seat
headliner
drive train
rear package tray cardboard
dashpad
etc...