Hey guys, I am going to replace my engine mounts, the old mounting bolts on K-member side are changed out by some metric bolts with lock nuts, thread inside the nut is drilled out so i don't know the size. As far as i came these bolts are 7/16"-14 x 3-1/2" long, correct? I don't want to modify my new mounts so i need to get a set of proper grade 8 bolts. '69 Coronet with 440 engine if it makes a difference. Thx!