Reclining seats. Custom seat rail?

[7057sam]

I've had had booth omp base plates and cobra mounts

Omp where 90-100 a pair literally just a plate with bolt hole in it so you can do whatever too.

Cobra ones a lower mounted and directly screw into rails on cobra seats and have a seat belt/harness hole on the side. 

If like to tinker around and good with a welder go for ruan's option if not buying them would be easier.