We have been making a Differential Cut Spring perch since Day 1 but even those left something to be desired. These are an all new approach (updated 3/19 again) to the problem of what to do with the Ubolt after an SOA or Knuckle turn. This style fills that gap with a more aggressive approach. Forget that ubolt and use 2 - 5/8" Grade 8 bolts through 3/8" plate for the housing side. The Pumkin Shoulder has a weld on section available in 3 angles so you can fit what you are doing. We offer a Zero degree choice for FJ40's without the knuckle turn, 8 degree's for a stock FJ60 or an FJ40 with the turn, & 14 Degrees for an FJ60 with the turn. This way you can dial them in to what YOU are doing, not what someone thinks you should be doing! We make these only in 3/8" plate so you can rely on the weld since you will only have 1 Ubolt on the passenger side, the drivers side is 3/8" also to match......And yes, these come in a drivers and passengers side pair. UPDATE 3/19, We have moved the front hole 5/8" farther forward to aid in setup with FJ60's, this dosen't affect FJ40's but with that change we added the ubolt plates as standard because they are special to match the wider stance.