Go to the Tech Page. Under reproduction parts click on Vancouver Parts Connection. Contact Franz Fraitzl through this link. I'm sure he can help you either with parts or information.
The following is from a Hollander 9 th edition.
1928-29 Durant series 55,65,75 uses Nice #4958
But there is also a listing for Durant 28-31 all except 614 that says Nice 5094-1. This may mean that this higher number bearing will also work.Bearing 5094-1 is listed as fitting:
Buick 1929 Master
Durant 28-31 all exc 614
Stude 26-28 some Std,Spec,Dict
Whippet 26-30 4-96,96A
30 98A
Willys Knight 26-29 70A
A later Hollander says Nice 5094-1 ,ATB #A397,and BJI # N397 are the same Bearing.No cross reference for 4958. Warren