Rear Main Seal is made from a rubber material for the 1934-53 Buick 8 cylinder 40, 50 series. The RMS is not used between 1934-1938.
Take note that due to engine machining variances, seal performance may vary.
Best set# 3764
Made in the USA!

Buick 8 cylinder 1934-53 40, 50 series Rear Main Seal, rubber