Hot Rods Locker carrier Halibrand

Hi All
I’ve got a Halibrand Champ in my 31 with a Locker unit in it.
I’ve got an extra Locker unit and carrier but I don’t know what it is or who made it. I’d like to find parts for it( looking for springs with different rates so I can lighten up the locking or unlocking in turns a bit). The springs feel like they are 100 pound springs . I’m thinking 25 or 40 pound with my tire size may work better it tight turns on the street. I’d even swap for side and spider gears carrier if any is around.
Any body know this unit?
Early Detroit Locker? Richmond?
Google no joy. Some close but not the same.

Terry