Fuel pump spacer.
#3
If you are meaning the spacer that goes between the engine and piston-lift-pump, that is a Cummins part and the numbers have been changed a couple of times.
The spacer is no more than a piece of 3/16" steel that has a slot for the pump-rod and two mounting holes; if you are careful, it is an easy accomplishment to make one by using the mounting side of the pump for a template.
Before you start, come up with either a couple of studs, or all-thread of the appropriate size, to install in the engine; rather than fighting with so many layers and trying to line up bolt-holes, it is much simpler to simply stack everything up on the studs, then apply the nuts.
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