Moser makes a fabricated 8 3/4 housing, but it looks NOTHING like a stocker, and by the time you are finished putting one together..... a dana is stronger and cheaper (and so is a nine, probably).
When I need a rear for one of my 55s or 57s, an 8.8 will be the #1 option. Either a mustang, or a narrowed explorer. Same basic strength as a 12 bolt chevy, wide parts upgrades available courtesy of fox mustang racers, can be found with good gear ratios, disc's, and lsd's. What's not to like. LOTS cheaper to buy/build than anything of comparable strength, and much more available.