Our Oldsmobile pulley kits are made from 6061-T6 billet aluminum and machined in the USA. Oldsmobile used 3 different water pump lengths on their engines. We have pulleys designed to work with both the 5.6" and 6.0" tall water pumps.
5.1" Tall - E-Body with A/C 5.6" Tall - All Others 6.0" Tall - A & E Body without A/C
We always recommend measuring your water pump before ordering.