The "5O" code has been observed a number of times. Thanks to Ove Sjoholm of Camaro Club Sweden, we have found that this code appears on all Swedish export Camaros (it has since been observed on most Camaros exported to other countries), suggesting that it is related to the export conversion of a Fisher installed component. Ove has noted that Sweden had more restrictive belt/harness requirements and it is known that Swedish Camaros had Swedish-compliant belts added locally. We have also received corroborating evidence of this code being a seat belt delete on Corvair from the 65-67 Corvair tag code research of Kent Sullivan and crew.
http://cgi.ebay.com/ebaymotors/1967-RS-Convertible-pwr-top-327-muncie-4-spd-deluxe-int-fold-down-seat-/330696425285?pt=US_Cars_Trucks&hash=item4cff0aff45
Paul
that 's just the same in FRANCE , my 327 L30M20 have this "O" Too and no seatbelt in the car.
I think you're reading this wrong. I don't think it's read 50. I think it's group 5, and option O (letter) or O (zero).
you're right !!
the number is the option groupo the letter the option itself