The T&D IMA roller bearings were 7/8 OD (same as Mopar shaft..remove and run on stock shaft?) and 3/4 ID IIRC. Wonder why the castings didnt extend all the way to edge like T&D or PRH's Crane/MP BB rockers? Would make them that much stronger...
Can't say about the above, but I do know you can tell T&D you want the rocker bushed and not use a bearing and they will do it. They will itch and moan about it, but they will do it.