I don't know for sure, but if they were before the Blaster, presumably they would be something like 250k log taper. So the mil-spec part numbers would be something like:
Those would have 1/2" slotted shafts and 2 different log tapers.
The same things with flat-top shafts would be:
Clarostat and Allen-Bradley were two different makers, btw. I've heard both brands mentioned, but Waldo's page mentions Clarostat.
If the volume pot was after the Blaster (don't think it was until the OBEL came along) then you would want something like a 25k pot instead -- so same part numbers as above except change the 254 to 253.
Hope that helps, a little...