Has anyone used a quicktime bellhousing for a 360 to a/833 od transmission

On the OD transmission, the bearing itself comes I. Two different sizes?
307 vs 308 bearing retainer

Ok so i might be a bit slow understanding this but for that one did you take a bellhousing with the smaller bearing and machine a spacer? Sorry I’ve been trying to find a bellhousing specific to the 75-76 5.125 retainer but if there’s some way of taking an older bellhousing with 4.80 retainer ring that would make all this much easier