After slamming my right fron tire into huge pot hole, I have been notified by two auto technicians that my right front wheel is out of caster and therefore causing my mis-alignment. The dodge dealership says I need a new lower right fron control arm and steering knuckle. He showed me underneath the vehicle how the rear facing bushing that connects to the torsion bar going back under the cab of the truck, that the bushin has come out about a 3/16' of an inch. And also how the steering knuckle is not having the same measurements away from the inside wall of the tire as the left front steering knuckle measures. So he says I need those two parts and the bushing for the lower control arm. I have found a set of steering knuckles for my truck on ebay, but I can't find a control arm. Any ideas on where to get one new or used and not going thru the dealership prices?

Thanks!