Seat Belt Rail in 4 Door

[GSJones]

My 4 door E30 came with only a driver's seatbelt, so I purchased a new one. However, after a little reading around, it would appear I've been given a 2 door seatbelt? My driver's belt is bolted to the seat with the bracket that's connected to the belt, itself. My new belt doesn't have this bracket and it would seem that it needs to be mounted to a rail.

So my question is, are the mounting points for this rail present in the 4 door? I don't have a rail in my possession to check. From what I can find in some videos and photos, it looks like I at least have the bolt hole in the floor where it mounts next to the seat mounting bracket, but I can't find a picture of where the other end mounts.

I just assumed they all bolted to the seats, regardless of model

[brutus]

hi,
yes the seat belts are bolted to the seat on a four door & on a coupe its mounted to a rail yes,
so yes 4 door belts are different to a 2 door,
,,,,,,, however if u cant get a new 4 dr belt, i have a very good one available,