How in the world did you break the front bearing retainer?
You could call up
THESE guys, they have a shelf full of SM330 parts - they may have a car front bearing retainer for you.
I bought one several years ago for what was then my spare 'A' gear set transmission, so i could part with it...
If you are able to turn down a truck one, I'd prefer to part with that one.
Car front bearing retainer installed:
Truck front bearing retainer installed:
I found the casted part numbers too hard to make out - which is why I never gave them in my own "wanted" thread
HERE.
Here is the machined face of the truck bearing retainer:
You can see that there
IS enough meat to machine it down...