Help with fitting Sparco sprints

  1. My model of MX-5 is: 2000 NB 1.8
  2. I’m based near: Chester
  3. I’m looking for technical help or recommendations on:seat belt buckle with bucket seat.

Hi all, I ordered some Sparco sprints for my 5, I was recommended to order the jass performance adapters to use the standard rails. The issue I have is the NB has the integrated belt buckle on the seat rail. The rails will not fit on the seat. Is it okay to mount the buckle to the bolt on the side of the seat or would I need to attach it to the transmission tunnel somehow? I’ll order some rails without the integrated belt buckle to get the seat to fit.

Any thoughts or recommendations would be appreciated.