theres only one version of 5.13 ever made. regardless if theyre manufacted by aam, or the yukon / nitro brands (both made over seas). they fit gm 11.5aam and all dodge ram 11.5 that ARENT coil spring. so all years 3500srw and 2500 prior to 2014. you following me so far ?
in the front,pw has thin flanged carrier and thats why they cant be installed up front without spacer or sliding the carrier 1/4" with the side adjusters but i think the driverside axle shaft end may need to be grinded to do do it this way and honestly 1/4" seems like alot to move the carrier.
dodge should of made all the trucks plug and play with gm then there would be tons of options without mcgyvering **** together