GM Genuine Parts 178-1037 Power Brake Booster Assembly

This was an exact match to the factory GM one that came with my truck. My original lasted until February of 2023 with 321,000 miles on it. I was going to go rebuilt, but this was not much more and I did not have to mess with the core.Mine came in an ACdelco box. Very happy with the purchase. I will say after watching a few videos online the job only took about 1.5 hours and that included bleeding/flushing with new power steering fluid.When I looked online I thought I needed Synthetic PTF, but when I checked my diesel supplement manual. I searched that number and the new GM number was for standard off the shelf PSF.Flushing out the old fluid did make a big difference in braking.