GM Hydroboost 178-0982
Was $131 when I bought it a week ago, price went down since to $113 at the time of this posting.
It fits an ACDelco Professional 18M2404 master cylinder that I have.
Also, the booster comes with the spring, spring retainer, and rod in it,
albeit a plastic rod. (Edit - It's a metal rod, it's just painted black, I just took it out setting the rod to master cylinder clearance)
I have a cardboard template of the firewall gasket I made when I replaced the gasket on my original vacuum booster. The backing plate bolts fit that pretty well, I won't know for sure until i get a chance to install it.
The rod end for the brake pedal measures 0.600" and is stamped 778501.
Anyways, here's the link
www.amazon.com/dp/B08MR128KY/ref=as_sl_pc_tf_til?tag=&linkCode=w00&linkId=&creativeASIN=B08MR128KY
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