Things have been a little hectic the last few weeks between work and home so I chucked the box in the garage when it arrived without a second thought. Tonight (well, last night now) I finally got around to opening it up. On attempting to mount the saggy I immediately noticed something was wrong. While all the bolt holes appeared to be correct, the pump would simply not fit in the bracket. Thinking I'd had an odd ball pump, I grabbed the two other saggys I have in the garage and found the same problem with them. The issue, I soon discovered, lie in the top of the bracket where the sleeve for the pivot bolt and the square hole for belt tensioning were located.
Apparently my bracket had a clearance issue at the top, with too much material preventing the pump from fully seating.
Picture time. Sorry for the quality. iPhone and my trying to get the work done so I could get back home.
Here you can see the pump resting against the top of the bracket. No bolts are holding the pump and bracket together.

Here the pump is still resting on the ledge at the top of the bracket. You can start to see the issue with the bolt holes not lining up.

Using several thin rods (also known as "screwdrivers") I lined up the bolt holes on the bracket with the mounting holes in the pump. Here you can see just how much material there appears to be in excess preventing the pump from fully seating.

I took a drive to work, grabbed the cordless grinder and went to town. I wound up removing close to an inch of material from the bracket to gain the clearance I needed. And here is the end result. Two bolts in...
Short pause while I grab my AR from under the bed. Don't usually hear gunshots in this neighborhood.
Any how, two bolts in to the pump through the bracket. Presto. I'm back in bidness.

Normally I'm not a big fan of modifying such a clean looking piece of hardware. But it's Saturday now and I know WH won't be open again until Monday. I will be giving them a call to let them know about the fitment issues. Did a little Internet research tonight and didn't find any other mention of this type of problem. So I'm thinking I got the part made the morning after the Super Bowl.
And the hydroboost install continues.
Update: found one thread over a CB.com stating the same issue. Apparently the pump guts can be rotated if you loosen the fitting retainer.

And now there is a helicopter circling the neighborhood. When did I move to Compton?