Swarbrick Racing is the easiest option in the UK, I ran his cans on my MC21 for a couple of years.

They sound nice - not too loud, and are (well, were!) well priced. They are also hand-made by Mr. Swarbrick himself!

Current cost is £135 + VAT and shipping a pair.

You could also order TYGA Performance or Jha or similar, but remember you'll have to pay overseas shipping charges and possibly import duty as well as the VAT.

Andy.
NSR-WORLD.COM