Manual steering box what are you using 3 bolt or 4 bolt?

[Burnhard]

What manual s10 steering box are you using, the box with 4 bolts or 3 bolt cover in your G body cutlass/GN/SS/GP ?

I read that the 3 bolt cover box is a Saginaw 525. What make is the 4 bolt cover box and model number?

Doing more research before I start buying cores.

Thanks

Bernhard