Sparco subframe installation

Hi there, anyone installed sparco seats with subframes? I have removed original sport seats and the original slider, but somehow it is not a direct fit and require to remove some other parts from it.. not sure if I have to do it and how.. seems I took it off I cannot rollback anymore.. mhmm..
 
I had a similar issue with a different set. Turns out, the garage needed to remove the seat raise and lower mechanism to get the new subframes to fit. Might be your issue here to - they were not a direct off and on job, but no cutting was required, just a little more dissassembly.