About two years ago I bought some front springs from 4WPW that I thought were for my truck (75 Blazer). I just got around to putting them on Friday. I did not realize until after I completely removed both springs that the spring eye on the front of the old springs is larger than the spring eye on the front of the new springs. The old ones use a 9/16" bolt in the front. The new ones are the same size on both ends which would be a 1/2" bolt using the bushings and sleeves they provided. Bad news is that the springs have been in my possession for a couple years AND I just drilled them to move the axle forward 1.5" so I think returning them may be rather difficult. My questions are... 1.a. Did they give me the wrong springs? 1.b. Are the old springs the stock size or did a previous owner upgrade to the 9/16" hanger bolt? 2. Does anyone know if I can drill out the new poly urethane bushings to fit the old 9/16" bolt and sleeve? 3. Any other suggestions or things to think about? Thanks. *************SOLUTION************* Superlift part #'s 01-235-06 Six inch front springs for a 75 Blazer (and many other things) 315 Bushings for above springs 315-88 Sleeve kit for 9/16" Bolt in above bushings The problem came from the fact that Superlift has the wrong description for this part number 315-88 in their parts book. It (the sleeve kit) is not for '73-'87 Blazers, according to this book, which actually have the 9/16" bolt and need this part. According to the book that 4WPW has, it is for '88-'91 Blazers. Which we now know, have 1/2" bolts. I finally got a guy at 4WPW to call the Superlift tech line and ask what to do to use 9/16" bolts without mentioning a model year, as, I have no doubt, this would have confused someone.