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2mm wider than internal.
I just bought a roll of: http://www.ebay.co.uk/itm/Tesa-Tape-4289-no-tubes-rim-tape-complete-roll-25mm-wide-x-66-metres-long-/162354590164?epid=519694448&hash=item25cd1671d4:g:8wYAAOSwpdpVZtc~
Same as Stans stuff but much cheaper. I've found buying a 10m roll which rim tape is often sold in will just get you a double layer on two rims. This should last me a while!
Thanks - ~2mm wider than the internal or external diameter?