[RodB]

Hi and welcome to the Phorum. You can replace the dual 20mfd cap with 2 - 22mfd 160 volt aluminum electrolytic caps. Tie the common negative leads together and you have the same as the original, but smaller. Like Gary mentioned, you can remove the guts of the old one and insert the new parts. Use a black wire for the common and red for the positive leads. Fill the ends with hot glue.

Some will mount the caps on a terminal strip and run the wires to the strip terminals.