[bobcowan]

cars that have a Ford IRS generally use parts out of a Thunderbird or Mustang. Ford and other vendors often have the parts on hand.

But, unless you're a really good fabricater, you're pretty much stuck with whatever your car was designed to use.

As for power capacity, that's variable depending on use. For street use you'll have a tough time braking the pasrts. Drag racing, though, puts a lot of strain on parts. Things will break pretty regularly.