Seat Mounting Brackets & Rails
Using the donor cars seats in order to pass IVA, some mods are needed for the rails.
Basically there are a few cuts and some straightening out that you need to do.
Then add steel flat bar
There you go, I think all the pictures are pretty self explanatory
These will be swapped post IVA for the classic 50's buckets, more period and way way lighter than these.