My guess is the POL kit is essentially a scarbird kit with all the parts in one shipment.i doubt they have reinvented the idea , but rather put their package together as a one stop shop. What appeals to me with the POL kit is powder coated calipers and slotted disc option without me having to go out of my way and time to do the same. Price seems reasonable compared to me shopping for the new parts at the local parts store. Plus considering my Riviera is not going to be original, but rather a rat rod style car. My car is almost perfect inside and out and what remains is braking and the engine running reliably (which I believe to be a brake booster issue) and figuring out some wiring I missed withe AC system when I replaced the heater core last winter. 3 herniated disks, home improvements and 80hr work week have slowed me down this year not to mention my C7 corvette project that is now done, so I’m determined to gett the Rivera done this winter!