[t korinek]

The hardware kit has a lot of extra pieces included in case you never had seatbelts, there are 2 fine thread bolts that should thread in to mount the upper mounting points on the shoulder harness, the retractors bolt to the floor with your original bolt, in the original hole.
If the shoulder bolts will not go through the lap belts I can send you 2 bolts that don't have shoulders on them.

Thanks
Tom