Need an Idler arm for my barracuda (special need)

I need an idler arm for my 69 barracuda fastback. It was originally a 318 car but has had an engine swap to a 360.

The funny thing is that when I go to order it at an autoparts store I get the wrong part. The one I have is like the one in the picture. Please let me know what year and model does the idler arm belong to so i can either buy from you or order it from somewhere else. thanks.