Dad found a 67-68 Comet Capri. It has a rearend with no back cover plate, it's not round but kinda rounded rectangle, so I assume it's at least an 8 inch. (6 cylinder car). The bone yard is not sure exactly what year it is. Do you think this would fit my 66 Mustang? Sorry to ask all this but I don't live with my Dad and he's about 150 miles away.