This square FIA-Approved Backing Plate from Sabelt has 7/16-20 female threads to accept a standard forged safety harness mounting eyebolt.
Gates Hose I.D. Reducer, 2-1/2 to 2-1/4
楽天市場】サベルト アイボルトバックプレート シートベルト取付け用 FIA車両規則準拠 7/16 20 UNF Sabelt : Star5 スターファイブ
Seat Belt Eye Bolt 23 mm UNF 7/16-20
Six Point Lap Belt Termination Points - Rennlist - Porsche
Racing Harness Pads & Accessories
Seat Belt Eye Bolt 23 mm UNF 7/16-20
CCMI0016 Sabelt Eye-bolt back plate : Automotive
Black Silicone Hose, 3 3/4 x 3 inch ID Straight Reducer - Pegasus Auto Racing Supplies
6 Point Harnesses at CMS –
Racing Harness Mount Backing Plates
Raceparts UK Ltd 2018 digital catalogue by racepartsuk - Issuu
5 point safety belts RACES Motorsport series, 3 (76mm), gray
sabelt サベルト アイボルト バックプレート CCMI0016 (1本) - 内装用品
Pack of 4 Seat Belt Harness Mounting Backing Plates 7/16 UNF Thread 65mm x 65mm.
Seat Belt Harness Eye Bolt Backing Mounting Plate 7/16 Thread UNF
BMW Seat Belts and Racing Harnesses for BMW 2 Series F22 (2014+)