i don't have my OEM R1 spring handy to confirm the physical dimensions of this spring, BUT if the spring is the metric equivalent of 2.25x7", then here is another source to replace the 9kg/mm OEM spring with a spring rate suitable for the direct connected Versys/ER6 suspension.
Cannon Racecraft custom R1 springs now cost almost double what i paid a few years ago. good product, and no complaints with their service at all, just the price.
confirm your spring dimension, then check here...
i have not used this spring. please report back on your experience if you do.