Thought crosses my mind
Okay...
If one has to use separate caps usually meant for circuit board work, I was thinking that you could make small circuit boards roughly the size of the cap holder wafers. Except instead of the big center hole and slots for chassis mount caps, have several holes for cap thru-hole leads with islands of circuit board copper trace. And you'd solder the wires and resistors that went to the old multicap lugs to these islands. Make the islands region smaller than the chassis cutout, and mount the board to the chassis like the old cap wafer was. You'll probably want to maintain isolation of the cap grounds from the chassis, to avoid ground loops, if the original was also done that way.
This would also allow the use of big caps without having to use cap clamps. To make it look more like the original construction than a repair lashup.