They used that package bridge a fair bit. KBPC102 is 3A, 200V. You can get KBPC108 from mouser I think, 800V but should be same size. Or you can use the kind with lugs and run wires. Best to keep it flat to the heatsink like that package though, rather than the upright style.
Probably didn't use the fuses in this version, some of them did use low value resistors to act as fuses for the LV supplies.
And since someone's already been in there, make sure it has the proper insulator bushings so those transistor screws don't contact the heatsink.