[quote name='Mr. Foxen' post='837301' date='May 14 2010, 03:32 PM']Fairly sure there isn't a right one, just one of the disc ones and stick it under the 'bridge'.[/quote]
Yep - just use whatever they've got - I think I paid around a quid for mine, but check the wires are soldered properly I had a few where I had to resolder them and as they fell off when I took them out of the bag. It sounds best with a preamp (behringer ADI-21 works well for me) and the shorter the cable the better.
I used one of these little buggers: [url="http://maplin.co.uk/Module.aspx?ModuleNo=3202"]http://maplin.co.uk/Module.aspx?ModuleNo=3202[/url]
I think I just went for biggest they had in stock at the time.