Drive coupler and gimbel bearing help
 

I redoing a 2000 cig Mystique, it had 500 EFIs in it, i redid the the motors to 509s with stage 2 whipple kits, it had bravo one drives, which I'm changing to XR sweptbacks and -2sportmasterlowers. i had one bad drive coupler, but thought i might as well get new ones, the good one is 12 years old. now my question is what should I use....the old one had aluminum hubs, i read on here some where that they make a steel hub, what should i use with the motor change and HP?????and does anybody have part numbers, also gimbel bearing going from starand bravo to xr what bearing do i need....thanks for any help....Joe

steel coupler 861523A20 p/n (longer splines) but you can use 18311A17 steel as well and be ok too, $200 cheaper

gimbal bearing 30-879194A01 nothing special