The stock belts can be routed through the lower holes in the side of the seat, that will let the belt fit tight against your hips. Just remove the lower bolt that holds the telescoping belt, route belt thru seat hole, and re-attach.
The stock sliders are very tall. If you want sliders, I suggest taking a look at Recaro sliders which are the lowest ones I could find. They will need an adapter, which Brey-Krause sells.
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