So my immaculate B110 seats don't fit to my liking. They are much different than B120 seats.
Fast forward to Xmas. Santa delivered me new eBay cheapies.
I was a little disappointed in the fact that the mounting points on the bottom of the seats were completely covered in the seat material. I had to cut away material to access the mounting threads. For reference the seat mounting points on these eBay cheapies are 10 1/16th" wide X 12 1/8" long.
Pretty different than the factory mounting points so not much opportunity to use the stock rails.
The universal sliding rails that came with these seats also came with different seats I put on the coupe before i sold it. I didn't use them then because the sliding mechanism is crap.
So more custom mounts to be had!
Bottom of seat.

After thinking up elaborate ways to use the stock rails or weld or fabricate i decided to KEEP IT SIMPLE STUPID.
I decided to take one 1.25" and one 1.75" section of mild steel angle and simply drill and bolt them to the factory holes as a base for the new seats.
Rails with measurements

Measure once drill twice.
Rear rail had to be trimmed at 45 deg angle to fit next to the tunnel.
Drilled

Alt view

Front rail

Trial fit of the seats told me I needed to prop the back of the seat up and give them a tilt forward. One, to avoid headrests hitting back glass and two, to make seat not as slouched with the seat belt hitting passengers face.
I bought 1/2" spacers made of nylon but was not enough so I had to raise the whole back rail section another 3/8 or so. So it kind of "floats" above the factory rear mounts
I am not terribly happy with that. I feel the weight is more direct on the bolts so I may lower it back down and get spacers milled or try find online....suggestions?
Here is one seat installed. Legroom slightly diminished from stock but seat is lower which is good.
Also need a way to lower seat belt height...suggestions?
Rails

First seat installed
