pilot bearing

Does anyone know, which pilot bearing I will need for a 4 inch scat crank. I ordered the ram brass bushing from summit and it's to small. I think I am going to have to use a bearing type that goes where the converter used to sit. I'm hoping for a part number if anyone has ordered one of these. I would think the cranks where machined the same as a LA crank I don't have a mic to check but beings how it fits the conveter I thinks it's the same.