HI GUYS! I have been busy moving Power Brake for a sometime, and have not been on for awhile. Delco aftermarket does have some truck hydroboosts they can get from a grandfathered in deal with Bosch, but there is no direct bolt on unit for the Buick or any car, from Delco or Bosch. We designed our own mounting brackets to line up with the Powermaster pedal. We also use a different bracket/rod combo if someone is using the vacuum pedal, or for other G bodies. The G.N. s used a special angle bracket to change the pedal ratio to a higher pin location on the pedal. The hydroboost and the Powermaster both use the higher pin location. The vacuum booster uses a small 7/8" master, compared to the Powermaster's 1 1/4" piston, so that pin location is lower to stroke the little master farther. We have a special O.E. contract with Bosch, (the successor to Bendix) for new Hydroboosts, but the brackets and rods HAVE to be changed to fit the G.N. The rods are crimped in, and usually the booster will be destoyed, trying to pull out the rod, without a special puller. Check rod angle closely before bolting it on! With our move, only the 800 504 1060 tech/order line is available for now.