3.0 Roller Lifter Update from Flat

[BrendenP99]

Hey forum, Lucky me found out my 1991 3.0 vulcan block is a f2de casting. Originally came with flat tappets. My thought is I can update it by putting in a roller cam, roller lifters, roller push rods and lifter retainer "spider". rocker levers are same part number so I can reuse mine since they look good. Anybody by chance have the Part Number for the lifter retainer "spider" that keeps the rollers from twisting in its bore? Having a hard time finding it online. Probably will end up going to the junkyard to find one. Also if you suspect this can't be done I'd like to know.