I think you may find it hard to find one it decent shape to reuse. It isn't that hard to fab up one that looks identical to stock.
I bought some 3/8" cold rolled rod, put it in a vise with a little heat on it to put the two 90* bends in it and then cut the 3/8 threads with a die. If you follow to the bottom of this linked thread you can see the final product.
http://67-72chevytrucks.com/vboard/s...d.php?t=656862