The 55 1st springs are different from the 53 in where the locating pins are for the rear end housing. You may find that the rear end mounts a little over an inch too close or too far back. I would stay with the 53 springs and rear housing with cables and install the 55 1st carrier into it. I think that way is a direct bolt in? I don't know how the front pivot style of housing works with an open driveshaft though. I may be giving bad advice here.