Need kelsey hays spindle/ball joint bolts

The bolts you need cannot be bought from a hardware/auto parts store?
I have the same brakes, but I have not had them apart ever.

Well, I was going for stock bolt but thats what will happen if I can't find'em.

I do notice a tapper in the threaded bolt holes so it had me leaning towards stock bolts.

Who here has studied these brake setups?