307 vs 308 bearing retainer

Finding a machinist so far that will do this, turn down the bearing retainer or enlarge the bell housings hole, hasn’t been fruitful and there all behind if even open due to the COVID-19 shenanigans. This is why I wondered if I could just swap bearing the retainers. 307 - 308.

Brewers lists a 4.80 diameter large bolt pattern unit with the same size snout. It would be great just to swap parts and go.

If I could or had to swap bearings themselves, if there is a difference? Then I’d do that as well. No problem.

yes you can swap the smaller 308 bearing retainer onto a OD trans just did it on the one I recently rebuilt. Oil hole and bolt holes line up no problem.