Front drive mandrel

Ok fellas i need dome help here.
I'm installing a vacuum pump and an alternator on my 557. I'm using a motor plate and after looking at a lot of brands/styles I'm not sure whos to use. I have the ford racing balancer w the stepped front. Whos drive would you guys recommend?

Bump for some help.

The moroso is suppose to fit the stock balancer . I bought one but it is at Jet Boat Bobs. Its not together enough to test it yet. I called moroso before I bought it and they said they mocked it up from a ford.

Peterson

if I remember correct the ford racing balancer has both ford and gm bolt patterns.ford has 4 bolt holes gm has 3 bolt holes moroso makes both.i used the gm pattern because it was available when I ordered.it comes with various spacers etc to put the pulley were you want it.you may have to put a spacer behind the pump to get the spacing exact.

Larry I believe you got the bolt pattern backwards ford is 4 bolt and chevy 3 bolts or the one I have messed with. The early model fords had 3 bolts but that was way back on some 289s and 260s I think been along time like back in my teens when I mess with a couple of them.