Here is how I did my swap.
First off to put the wider e36 seat in you have to modify the lower seat belt rod. If not, it causes the seat to rub on the center console. I cut 6.25 inches out of rods center section and welded them back together, so that I could get full seat travel. Then I re-drilled holes for the lower bolt and made up a plate with a nut welded to it to distribute the load in case of an accident. (The nut is a 11mm x 1.25 pitch, I looked everywhere trying to find one, then it turns out it is exactly the same as a 7/16-fine thread)
Buy the way all the plate I used was 1/8 thick, would not use anything thinner.
Now for the seat adapter plates. I welded a 1.25 inch bolt to the bottom of the plate (not required but makes install much easier). In my drawings note the hole for the original bolt location. The drawings are for the drivers side for the passengers side you just need to flip the rear plates over because they are the mirror image.
Picture of drivers plates:
Drawing of drivers plates, note that I rounded the corners of the plates so that they did not dig into the carpet and also the rear plate near the console is very rounded so the the rear passenger doesn't jab their foot on the plate edge. The front door side plate is rounded to clearance the molded shape in the carpet. (all measurements in mm)
Drawings:
Here is a shot of the passenger plates installed, I put a few washers under the plates on the original mounting holes to compensate for the bolt head on the back of the plate so that they sat flush.
You can see with the seat installed the outer slider is almost touching the inner rocker and the seat on the console side does not rub.
And one last shot of seat installed.
Good luck
First off to put the wider e36 seat in you have to modify the lower seat belt rod. If not, it causes the seat to rub on the center console. I cut 6.25 inches out of rods center section and welded them back together, so that I could get full seat travel. Then I re-drilled holes for the lower bolt and made up a plate with a nut welded to it to distribute the load in case of an accident. (The nut is a 11mm x 1.25 pitch, I looked everywhere trying to find one, then it turns out it is exactly the same as a 7/16-fine thread)
Buy the way all the plate I used was 1/8 thick, would not use anything thinner.
Now for the seat adapter plates. I welded a 1.25 inch bolt to the bottom of the plate (not required but makes install much easier). In my drawings note the hole for the original bolt location. The drawings are for the drivers side for the passengers side you just need to flip the rear plates over because they are the mirror image.
Picture of drivers plates:
Drawing of drivers plates, note that I rounded the corners of the plates so that they did not dig into the carpet and also the rear plate near the console is very rounded so the the rear passenger doesn't jab their foot on the plate edge. The front door side plate is rounded to clearance the molded shape in the carpet. (all measurements in mm)
Drawings:
Here is a shot of the passenger plates installed, I put a few washers under the plates on the original mounting holes to compensate for the bolt head on the back of the plate so that they sat flush.
You can see with the seat installed the outer slider is almost touching the inner rocker and the seat on the console side does not rub.
And one last shot of seat installed.
Good luck
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