Hi Phil - i have in my shed a 2006 1 Vstrom 1000 shock with a preload adjuster knob on it. (swapped shock for Ohlins and the old shock been in the shed for a few years) These days i have a Vstrom 650 to ride. I will compare the size this afternoon (mothers day duties this morning) and get back to you. If all good, and i cant see why suzuki's shock manufacturer would use a multitude of different sizes, i'll send it to you for free. I have too much crap out there and was going to toss the shock anyway. BTW i am in Christchurch.