Replacement roof-mounted passenger seatbelt

Hi all,
I have a 1999 VW T4 Trident in which the cassette for the rear driver-side roof-mounted seatbelt has perished. I bought a conventional 9ft seatbelt for a T25 but it turns out because the Trident has it mounted to the roof, the ball in the mechanism kept locking the belt. Does anyone know where I can source either a replacement cassette or entire seat-belt that can be bolted to the ceiling to replace it?
Many thanks
AdamP
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Have a word with Securon. Last time I used them they made generic locking mechanisms with adjustable sensors. In fact last time I used them they were able to make custom-length belts on request, though I'm not sure if they still do that.

Looks like I might need the 4 point harness 264
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