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Transmission Disc Brake Kit
£186.83
The standard Land Rover transmission drum brake is great at collecting mud and water off-road, but not that great at restraining a heavy vehicle afterwards. What you need, then, is one of these new transmission disc brake kits, which is suitable for all Defenders.
ScrapIron Racing blah blah blah
There's a pic of the kit and there's even an 'X' on the back plate
Hope that helps