It depends on the size of your light, to the length of your bracket.
The measurement most people use is 120mm, for some reason i cut mine at 80mm and got away with it (as my lights are a slightly smaller diamater)
Hope that helps a little.
Dave
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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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