Two things:
I think the Diasec ones are approx £130 for the standard and £150 if you get the ones with a built in 'heat shield' which stops the warmer burning on the underseat piping on a Duke...worth considering rather than frying/melting the warmers first time out on the exhaust.
Also, a few of us tried some time ago to get a group deal on these...including Nelly (trade) yet no joy. They simply were not interested which seemed a real shame
