I'll try to find a picuture of the SW01.
Generally speaking the SW01 is the same as the SW02, it does fit all 1" lights (C,D,P,Z series) and Millenium lights like M2,M3,M4. They also work on several weaponlights - this is what they were for in first place: to make the operator wearing gloves live easier. /ubbthreads/images/graemlins/wink.gif
The SW01 is slightly shorter than the SW02 as it is NOT a clickie tailcap, it is rather a very chunky LockOutTailCap (LOTC) which works similar to your Z41. The SW02 is a clickie tailcap and has a large rubber shroud similar to the Z48/49 to prevend accidental switching.