New Triumph Pre-Unit Twins Outer Gear Box Cover Gasket. Rebuild your Triumph pre-unit twin transmission the proper way with this English made gasket. Works with most Triumph Pre-Unit Twins (500 & 650) from approx 1947-1962. Please refer to your parts catalog for proper fitment.

*****Please check the photos to ensure that this gasket will work on your application.*****

Click here for the inner gear box gasket (57-1531G)

Made in England
O.E.M Part number is 57-1534G