I have found that it's always best to use the original parts. I have a repro and it pops when the door has been opened all the way. I may just need to file it a little. I had no choice but use new since the hinge was broken. Good luck
With all the decent origianl parts around go with an original. Russel at Mustangmania in Katy, Tx(houston) has them usually for what half the cost of a replacement one. either way a good hinge shouldn't be hard to find anyplace..