center seat with adjustable driver and passenger seats

[sailtech]

On my Series IIa, I understand how the standard seats fit with the seat rails. I have a set of adjustable rails and frames and I plan to purchase a set of deluxe seats from our hosts. What I don't understand is what holds the center deluxe seat in place.

The only thing I can think of is using the outer standard seat rails in the center. If that's the solution, will it require drilling new holes in the seatbox?

Any direction will be greatly appreciated, especially pictures.

Thanks,

Stuart

[siii8873]

there are two seat support rails (non adjustable) for the center seat and a couple of stops at front. These rails share 2 holes each with adj rails and have two seperate holes each IIRC