Hello,I don't have a 600 anymore and sold all my spacers / dogbones years ago. The dimensions of all the parts needed are listed on this thread, you'll have to track down someone with a lathe to fabricate the parts. Don't try & ride with the standard R6 spring if you're more than 7 stone weight or you'll end up in a hedge (at best).
Spring length - the R6 shock has an unusual 6.5 inch spring. Aftermarket shock springs are (pretty much) only available in 1 inch increments - a spring 5 inches, 6 inches, 7 inches, 8 inches etc. If you install a 7 inch spring there will be a lot of preload on the spring, even on the minimum preload step. If you install a 6 inch spring there will be very little preload on the spring, even on the maximum preload step. Hence the need for a half inch spacer to take up the difference. If you can find an aftermarket manufacturer who can make you a 6.5 inch spring then this is not an issue...but good luck with that.
Spring rate - when I was selling these shocks, I found the following rates most suitable:12 stone rider - 625lb per inch spring for solo use, 650lb if a lot of pillion work / hard luggage or fast road riding track days14 stone rider - 650lb per inch for solo use, 675lb with pillion / luggage / fast riding16 stone rider - 675lb per inch for solo use, 700lb with pillion / luggage / fast riding
etc etc
Dogbones - don't try & raise the back-end too much - there's the strong possibility of dogbone-to-swingarm impact you go shorter than about 124mms between the dogbone hole centres. I stuck with 127mm bones.
Happy modding