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Vorshlag and BK handle the lap and sub belt mounts, which is nice.
PCI looks to only have lap belt mounts.
I use a schroth 4pt asm mostly, but have used a standard fia schroth with the sub belts.
For PCI you have to get the sub seat attachment for what used to be about $35. It bolts onto the center part of the mount. I have both for driver(fixed) and passenger (slider). Both very solid.