Inertia Reel Seat Belt - 3pt FRONT Mini Sport

Mini front inertia real, retractable seatbelt (X1) 300mm stalk – Minisport

Inertia Reel Rear Seat Belt, Colors (SAC0198R-B-G)

Inertia Reel Seat Belt - 3 Point Mounting - Long Stalk

Anybody install a three point seatbelt in a two point car?

Would seatbelts be safer if they were five point harnesses (like kids' car seats)? - Quora

We have finally found a source of quality American made, 3-point inertia reel seatbelts that are suitable for British cars. Available in three colors

Replacement Style 3-Point Retractable Seatbelt

3 Point Retractable Lap & Shoulder Seatbelts

Inertia Reel Seat Belt - 3pt REAR Mini Sport

SEC254 - Mini Seat Belt, Interior Trim

3 Point Retractable AUTO Car Truck Bus Universal Black Van Auto-locking Seat Lap Adjustable Belt Auto Car Safety Accessories - AliExpress

Universal 3 Point Inertia Seat Belt Kit Car Truck Adjustable Safety Belts Red UK - AliExpress