Does anyone install the aftermarket street use reclinable seat such as the sparco torino by customizing the base? I have just brought two new torino and the seat rail, I can either buy the taitec base, which 1-3 wk wait and 490+shipping, or just customize the base. the local uphostery shop are charging me 350 for both customize base/bracket to fit in to factory seat mount. Is it possible to use the factory base and rail? How do you mount the harness/seatbelt with the new chair? Any commends will be welcome.