Hey, this is you 8 years ago.......... https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=646392

For the bolts and set screws and any other hardware, you have figure out the size and length and buy them. They are SAE American treads. I think there are variations of pumps depending on year and car or truck. Not sure.

There is a tapered lock screw with a lock nut I think. What happened to that tapered screw? Start reading carefully on page 6-14 here.

http://chevy.oldcarmanualproject.com/shop/1954truck/54ctsm0614.html

Scroll down to picture of "tapered bolt". If this is it, it's just a bolt with a tapered nose. Can be ground from a normal bolt. I'm guessing a 3/8-16 X 1 1/2 long. Length does not seem to be critical because a nut locks it after nose goes into something.
https://www.lowrider.com/how-to-tech/engine/0904-lrmp-six-cylinder-build/#

The AD boys will help from here. I'm guessing too much on an important part.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn