ddahlgren

It took 2 trips to Booster Exchange in WA but second one was free. Gave them all the vacuum readings pedal travel info MC part# everything I could think of. They are not 2018 brakes but work very well for 1991 technology. From what I found looking and GM dealer told me the 91 is a 1 year only part and a couple variations during the year. They needed a VIN number to sell me one if they had one and did not. All I can say if it feels like a bad booster acts like a bad booster it is probably a bad booster no matter how much you wish it was not a bad booster.
Dave