GM32 Instructions I Standard Belt Size Chart A Can be used if the size and or belt code is known i e Belt Length Code 3 a 380 32 50 AR 9433718 II Standard V Belt Codes and Numbers A Alpha numeric order B Can be used if 2 letter code is known i e EG 9433702 lll Model Usage Chart A This chart can be used by determining the belt required i e Power Strg Fan Gen etc After getting to correct belt section then Io cate model application following across the page to the correct En gine VIN code C l D and or Engine Option number This now will give the 2 letter code for Standard Belts refer back to the correct alpha numeric code chart and locate the service number of the belt needed 1987 GENERAL MOTORS SERVICE PARTS OPERATIONS OLDSMOB ILE 31 L 1 ooo cnoup 1 20 c nav 7 av