OK, feeling pretty inadequate and dumb, but how do I remove the passenger front seat on my W126? I have done the search and can not come up with an answer to my problem. There are 4 10mm head bolts that are located in the wells of the runners. I have removed those. The seat does not budge. There are 2 10mm head bolts at the rear of the seat below the runners that, if removed will allow the rear of the seat to lift, but I can't find any other bolts at the front which are comparable. Help, please!

If there is a thread that lays this out, please just cite it and I will use it, but I could not find one.
Tom