Robert, there are important and extensive mods needed to truly set the FGF up for success when it comes to safe 3-point seatbelts. Niklas modified and created new parts to achieve that.
Yes, we can all install generic kits that fit in our FGF birds (but don't truly protect us), or rely on the original 40-year-old 3-belt system that came with some of our cars (forget that!).
The FGF Body needs modified hardware to truly protect us and our loved ones while we drive around town and along the highway.
I've never seen any better and accurate mod than that of Niklas.
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?