At first I thought the metal collars were from the parking brake cross bar pivots,but they look a little small for that!
I think you may be correct. I bought a used emergency brake assembly and it's very possible that those parts came with it and the reason I never marked them is that I don't need them... that part of the system was still in the truck.
That spring is the one that goes on the end of the e-brake rod that pokes through the floor... I'm pretty sure. Not sure where the bolts go... maybe they are "extras" that come with every truck... you know, those parts that are always left over when you're done
