I have some 57 rearend parts taking up space in the garage:

57 Chevy rearend center section, pumpkin, gears, etc.

I have a couple center sections up for sale. These are NOT posi cases, but can be modified for posi if needed.

Fully rebuilt, 3.36, complete assembly - $250

Section with 3.55 assembly, the gears inside have some pitting, you will need to replace, or you could possibly run them if you do not mind the noise - $100

Complete 3.36 gearset, removed from housing, clean gears, spiders and carrier. - $100 (these were pulled from a running rear end when I upgrade to 3.73's)

I also have the stock drum brake setup, they were pulled when I went to discs. make an offer, sorry no pics of those.

https://www.kijiji.ca/v-view-details...dId=1393988983

1957 Chevy, rear end housing. The housing was sand blasted, primed and painted. I ended up using the housing already in the car, asking $300.

https://www.kijiji.ca/v-view-details...dId=1393985665

Sorry about the ads, but they have the pictures!