Yes, still available. I was not leaking at time of draining the fluid but I would replace the axle seals as well as the pinion seal. Since they are pretty old. They are real easy to replace.
No damage to the housing. The diff inside is busted though. The bearings are still in good shape though.
From a truck I parted out. The ring and pinion inside are damaged. I am not sure the condition of the differential but I believe it to be serviceable. Bearings are good probably could use some new seals. $200 + shipping.