Of the eight or so hours spent fabbing up everything and mounting a Sparco racing seat, at least two hours were spent head scratching and re-doing some of the work. So, here is some stuff to look at --
First, I weighed things. Here are the seat tracks on the scale, the COMPLETE OEM seat assembly w/tracks weight, and the Sparco seat weight,
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Something to be aware of. The Seat belt bolt is a T47, NOT a T50. Also, the seat track nuts are 15mm
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To remove the tracks, you'll need a 13mm socket.
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The adapters were fashioned from aluminum that was purchased from a local metal supply/fabrication shop. The track adapters were 2" x 3/16" L channels pieces, while the seat plates were 3/16" sheet aluminum that was bent at the supplier with a metal brake. This is where the head scratching, cutting, drilling, fitting, and RE fitting took place. After a couple trips IN and OUT of the driver's compartment I settled on how the seat would be bolted up, and it looked like this --
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And here is the result, with both OEM seat belt and 3" lap belt installed.
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Not as comfy as the OEM seat, but it will hold me in better. And, after the aluminum and nuts/bolts were added, the weight reduction is about 13-14 pounds.