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I have a pair of CG Lock seat belt locks (stabilisers) that I used in my car on track days to great benefit. No longer needed as I no longer have the car!
These were around £37 each from Demon Tweaks but don't seem to be readily available any more.
They allow the seat belt to be held tightly around your waist, keeping you in the seat really well.
A must (in my opinion!) for trackdays if you don't have bucket seats.
They are complete and have the Allen key to fix them to the belt buckle.
Would rather sell as a pair (as I only have one Allen key): £35 for the pair, delivered.
Image shamelessly plundered from Amazon - I only have the one set of screws (they suit the Impreza belts):
I left them on my belts all the time - for years. The locking bit removes so the belt behaves as normal, it just makes seatbelt "thing" (buckle? clasp? The metal clicky-in-thing) a bit heavier.
I had them fitted to my car about 8 years ago before I had harnesses fitted to my car,they work very well with any standard seat belt and really hold you tight in your seat not as good as harnesses but superb as a step up from just the standard seat belt.SJ.