I installed the Torklift today and took the bike out for a ride on the rack. It fit perfectly this time. A couple notes, and some points that are not quite clear in the printed instructions:
I did have that little tab that needed to be bent. I just didn't get far enough the first time to run into it.
You should probably fold that tab back on itself before you begin the installation. It is harder to do once the receiver is up in there.
Two bolts are longer than the other four. This was a change from the first receiver to the replacement. The long ones go in the middle pair of bolt holes. The short ones can be made to thread into the middle, but you really have to shove it up to get the threads to catch and then they only tighten a turn or two. If it's not easy to get the middle bolts started you're using the wrong bolts.
The tabs for the safety chains are near the hole for the pin which attaches the bike rack, making it hard to turn a wrench. With an adjustable wrench I could barely pivot it at all. A box end wrench is doable but will take a lot of turns. A socket would be best. I'll post some pictures when I get a chance...
The receiver feels very stout, fits well, and is as low profile as it can be. After getting the replacement I'm quite happy with my purchase so far.