I can't for the love of god install or figure out how to install this seat belt buckle onto the rails. I've spent hours on google searching and all I see are people somehow installing theirs perfectly without a single problem..

The picture
Another picture

 

I think you need to flatten/bend that tab on the buckle..

What I did (and a lot of other people) is just bolt a seat belt extender (http://4extender.com/) directly to the rail using the oem bolt

 

try to bend it with pliers. it will just break off