Graingers has steel thrust washers in a variety of sizes. I purchased 2 different sizes from them. One was .937"x.502"x.030". The o.d. is approximately .060" less than the thrust surface of the bronze pump driveshaft bushing in the block. Installed, the distributor still did not bottom out in the drive gear. Haven't run the motor yet. You just have to remember (or note) that washer is on there when you pull the pump shaft out or that washer will end up in the engine somewhere it isn't supposed to be be. I will try to find part#s in my notes. Bill