Backing plate to backing plate is almost 60". We were looking for a ZR2 rear but never found one at the Indy pick a part. So we were going around and measuring all the S10 blazers and found the trailblazer to be the right width. I forgot to check the lug count while we were searching but yes i need 5 lug to match the front IFS. Thought about looking for new 5 lug axles to put in it. right now i only have 92 bucks wrapped up in it. What do ya think?