Just thought I'd mention, my IVA tester said m12 bolts are fine for seatbelts. So long as the length it ok.
He also mentioned, the roll bar doesn't have to be threaded, you can have the bolt going through a sleeve in the roll bar with a nyloc nut on the bottom.
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My Build Diary - http://davesroadster.blogspot.com/
*updated 7/6/11*
Best bit so far: Getting it running
Worst bit so far: Cutting steel for wishbones and engine mounts.
Most annoying bit so far: Generator packing up half way through welding.
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