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If you want to put any reclining after market seats in a C5 you must remove the seat belt inertia real from the door sill area. I don't know if it can be repositioned. Most of what I've seen is people just use aftermarket 5 point harnesses.
Not sure on the Sparco's as I have Corbeau's, but almost all require the
stock seat belts including the lower receptacles to be removed. Mine is
not a daily driver, so I was good with this, but many are not.
Corbeau knew for sure what seat fits in the C5, I'd call Sparco direct.
I'm sure some tech would know which seats fit and with what modifications
if any...