i have 1995 vette seats in my tan calais. they are mounted on g body power seat tracks. best interior mod ever. i gained 2 inches of head room because the vette seats bottom cushions are like buckets. sorry, no pics, car is in storage.
I doubt you will find step by step instructions on that exact seat style. But if you have basic fabrication skills it's not that hard......just take measurements of the c5 seat base and the g body floor mounts and go from there.