I am replacing worn and bent leaf springs on my newly aquired 95 YJ Wrangler. Aside from weight rating is there a dimensional size difference between 4 and 6cyl leaf springs. I plan on towing my boat and adding a winch etc.... Makes more sense to upgrade to a heavier spring if there the same size and bolt right on. I have 2 inch shackles and complete bushing kits to replace the worn factory junk but im not lifting anymore. Will stock 6cyl leaf springs bolt to my stock 4cyl Wrangler.