Yea, they fit fine as i've got them. They have a rubber backplate that screws on first (as you'll probably already know).
I was planning on getting one of these for the fog, so it sits vertical
http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT
Look ok too.
The other option would be to get one of the old type square ones with a bracket bolted to the bottom of the tub for iva, then swap to the one on the arch after.
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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.