Parking brake assembly 73-87 (80) C20

[tate65]

Ok the kids 80 C20 failed inspection because the parking brake will not stay on. Tried several things, finally determined its the set pawl on the assembly the tooth is basically gone. (it was a forest service truck I guess they used it a lot), I was hoping it was just the spring but nope. Anyway I can't find just that part, or for that matter a whole new assembly. I may be looking in all the wrong places. I've found older and newer ones but not the 73-87? What's the part number? Who has them?

Considering "welding" a new tooth and filing as a last resort.