maz89
+1y
The ones I've seen being mostly used are the ones from Totally Polished, on the other hand, I've seen quite a few use the ones avaliable from Summit, Jegs, Speedway and places like that, mostly because the TP watts is $$ not wallet friendly. Other than that, the others where self made. Not sure of the measurements of the center cranks, but it may tell you on their web sites....... hope this helps man....