Anyone recall what the measurement at the shoulders(widest part in inches) is to not hit the door and work as a bolt in with the fd3s?

 

So...
depends on-

1) Do you require the seat to be centered to the steering wheel?
2) How far back do you need the seat to go on the rail (gets tighter as you go back).
3) Does the seat have the max shoulder width portion next to the door panel or is it up above against the windoe.

My point of rederence-
Bride defines its Lomax seat and rail system by two points.
1) centering seat to steering wheel and perfectly perpendicular to steering wheel for best ergonomics to minimize driver fatique.
2) providing the lowest seating position possible while adhering to point 1.

FD3S Bride Lomax rails and Bride Vios III Japan in my FD just touches the door panel at the shoulder with the seat all the way back. Does not stop door closing or seat movement with door close, but might wear one or both surface over time.

In my seating normal position there is a very slight gap between seat and door panel.

Bride lists Vios III Japan as 560mm wide at the widest point of shoulder.
This widest point is 590mm from bottom of the seat.

 

Can check this thread to see if the seat you want to use has been tried

https://www.rx7club.com/interior-ext...nt-fit-789715/