The trouble with supporting your own manufactures starts when their products are over priced crap. If the quality is there, nationalism / protectionism does'nt come into it. The financial crisis is really going to hurt Scotland, but the car manufacturing problem will have minimal effect (except to car dealers) as this was shafted long ago.
These are conventional oil shocks, they have DOT as manufactures / model name, black body, crome springs. Fitted to my B40. Purchased from Jimmy Morton Motorcycle at Mauchline, for trials. Cant really fault them.
trialsbits.co.uk supply a range of lenghts and bends but you have to roll the threads youself. (however they also sell thread rolling equipment if your pockets are deep enough )
I drilled a hole in one of the tappet covers on my B40, it breathes pretty hard through that. Did this several years ago and without tempting fate, reduces oil leakes elsewhere.