I have ordered mine via Halford.
You need 46mm for the wheel side and 41mm for the sprocket side.
Halford can get them with 2 or 3 days turn around. They order them from TENG TOOLS and they are about £16 each in satin finish (chrome is much more expensive, about £25).
Those come with a 3/4 inch drive though and you will need an adaptor (available from Halford too) from 1/2 inch to 3/4 (about £8) since I suppose your spanner will be 1/2 drive.
Also you will need a heavy duty Torque Wrench to operate that. I got a cheap one from ScrewFix.com (about a tenner). Not worth splashing a lot on such a wrench since this is pretty much the only time you are going to use it.
Better to spend the money on an acurate 3/8inch drive one.
Also I have bought a handy little Jump Start system from screwfix. Really cool to bring on track days. You charge it up at home and it provides power to jump start the bike (sometimes a problem on Dukes lets face it), light, and even a small tyre inflator! (about £50).
Cheers
Philippe
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