We have some bucket seats to go into the track car (Irn Bru) but after removing the standard Ibiza GTi seats the bucket seats frame does not reach the runners where the old seats were situated. We did consider for a second bolting them directly into the chassis and then immediatly seen that this was silly and dangerous lol.

Do we need a new subframe for the bucket seats to sit on that would bridge the gap between seat and runners?

If so are there any specific shops that we could get them from? Thanks

Attached are 2 photos of the bucket seats and what they came with....