Conditional Sale Contract from GMAC for a 1955 Oldsmobile S88. The Conditional sale contract shows the original price of 27.50. There is also a letter from GMAC stating the final payment has be received. Bill of Sale is for a 1955 8 Cylinder Oldsmobile DHC Model S88 Serial No. 558T12670 motor no. V 891297 total price 27.50.