Make sure it has 28 splines otherwise you will bw in for a surprise during installation. 3.55 came in the 03-04 cobras and they had 31 splines. I would not be surprised if thats what you have.
so who bought one from MPSAUTOSALVAGE on Ebay? They sold 1 of the 3 they were advertising then added another to make 3 again, then they upped the price from 299 to 399