2 each Primary Cover Gasket Pre-unit Triumph 650 500 Alternator 5T 6T 57-1057 * The OD is 1 1/16"

The OD is 1 1/16" the threads are 26tpi

This product is New - 39784 Lucas Ignition switch 35351 Triumph T140 1973 - 79 34680 Norton Commando / This is authentic Lucas switch

This is threaded to screw onto your 389 monoblock carb

These are standard for all Lucas electrical systems

Years: 1964 1965 1966

2 each Primary Cover Gasket Pre-unit Triumph 650 500 Alternator 5T 6T 57-1057 * The OD is 1 1/16"You will get the pair of primary gaskets that are pictured This is correct for the models described in the title If you have some other model with generator, suspension, or dynamo, then you will require a different primary gasket. Condition: NEW Brand: STEADFAST CYCLES Country Region of Manufacture: UNITED KINGDOM Manufacturer Part Number: 57 1057