i am the proud owner of a 1974 Oldsmobile Cutlass Supreme Colonnade Hard top with Y78 Salon package as at the 100th Centennial the GM people says this car does not exist as AJ57 all Salon were AK57 Wrong Answer i bought new in March 1974 daily driver many awards to include World of Wheel winner 1981 etc.. 1st Place !!@!!

 

Could you repeat that for the laypeople like me?

 

Welcome to the site, awesome car. I'm not that familiar with you year model, others will chime in with questions though.

 

Welcome. What's the second character of your car's VIN, J or K? The GM Service VIN cards show that it should be a "J", as in AJ57.