64 Chevy C20 Camper Special Parking Brake Question

[cshanek]

I recently bought a 64 C20 and have spent the last 8 weeks working on it. Last night I crawled under the truck to try to figure out why the parking brake did not work and to my surprise, I found it was just a collar which clamped around the drive shaft (see pic). I have looked around on LMC, classicparts, and other parts stores and cannot seem to find this anywhere. Surely this wasn't stock right? Any thoughts on where I can find parts? I tightened the nut at the bottom of the assembly and it is working for now, though I would like some new hardware once the underside is tidy.

Speaking of, see all that gunk in the picture? I have been manually scraping that off the truck now for about a week, and using brake cleaner, carb cleaner, engine degreaser, high pressure washes, and still have found anything that works other than crawling around and scraping. Any ideas here?