I bought this one from a fellow board member and installed it on my K/5 Blazer.
https://67-72chevytrucks.com/vboard/...hlight=booster
I'm not sure why they all tilt downward but I shimmed under the bottom bolts and leveled it.
The difference in braking is like day and night compared to the old factory one.
It easily locks all 4 wheels.
