Well, if you want to fix it, Rollo, you can buy the complete front control arm from Rockauto as well as most everything else. I'll post up a new Rockauto 5% discount code in the General Mustang forum.
The crankshaft seals are typically referred to as the front crankshaft seal and the rear crankshaft seal, respectively. Front and rear main seals is also another term to describe them.
Depending on your goals for the car, I don't see anything wrong with using factory replacement parts. I dont know anything about those TC's that Scotty suggested but, if they are inexpensive, Id look into something like that.
I suppose that the reason for the low idle must be that the torque converter is not "unlocking" all of the way and is causing too much "drag" on the engine for the IAC to be able to compensate for.