Yeah Sparco's base does have an inside belt mount, but I think that's meant for re-installing the stock 3-point system. It's kind of too close to the seat to get a good angle through the hole for a harness.
I have eye bolts on all 6 harness straps on my setup, but none of them are into tube walls. They're all on welded mounting plates (for the bottom ones) or welded tabs for the eye-bolts (for the shoulder).
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