This square FIA-Approved Backing Plate from Sabelt has 7/16-20 female threads to accept a standard forged safety harness mounting eyebolt.
This high-strength forged steel eyebolt is designed for mounting driver restraint harnesses with snap-in end plates. The 7/16-20 UNF threads fit the
Sabelt Seat Belt Eyebolt, 7/16-20 x 0.81 Shank, Each
Hawk Brake Pad, BMW Rear (D279) - Pegasus Auto Racing Supplies
CCMI0016 Sabelt Eye-bolt back plate : Automotive
Large FIA Seat Belt Eye Bolt Backing Plate Large backing plate with welded nut for eye bolt fixing Spreads seatbelt loads over larger area Prevents
Large FIA Seatbelt Eye Bolt Backing Plate
Seat Belt Eye Bolt 23 mm UNF 7/16-20
Sabelt Seat Mount Steel
Seat Belt Eye Bolt Backing Plate Threaded plate to fit eyebolt or fixing bolt Spreads seatbelt loads over larger area Prevents pull through 50mm x
Eye bolt backing plate
CCMI0016 Sabelt Eye-bolt back plate : Automotive
Grayston FIA Eyebolt Back Plate