I love Poly stuff. I have a ton of their brackets (upper/lower track bars, lower rear skids, rear sway bar, etc). Also have their high steer kit, track bars and tie rod. Great stuff and worked perfectly with AEV 4.5" springs and Bilstein shocks. Synergy is their brand they sell through dealers. Poly is the company and makes all the goods. All the stuff is very well made by some great guys.