833 Bearing Retainer Sizes

Can anyone tell me what the size of the bearing retainer and bell housing hole size is for a 833 OD unit. I have a Duster equipped with a OD unit and want to change to a true 4 speed. The tranny I am looking at has a 4.80 inch diameter bearing reatiner. Can I use the bell housing I have or do I nned to get a different one?