These spacers come included in the Warp 9 bearing kit together with two bearings, two seals, the tube that goes between the bearings -- all for $20 retail plus $5 shipping. I bought a rear wheel bearing kit last week.
Phillip, Thanks for the heads up on ordering parts direct from Warp9. I couldn’t find any spacers in their product list when I looked a couple of months ago. Regardless, I agreed to buy these spacers from gprix1 and I just sent him the $.
That is an extraordinarily low price for a wheel kit. Maybe they gave you the special ‘AoF Site Owner’ discount. Your price was about half of the
dealer cost shown in the ALTA parts list we got a few weeks ago. ($25 is also less than half of what I have paid for the aftermarket kit for my KTM and a third of the price of the KTM OEM parts kit.)
I may talk with Warp9 about a set of spares for each axle while they are available. Wheel bearings, seals, and spacers are definitely wear items. Now if I can just figure a better way to get the rear SM wheel on and off without taking the caliper assembly apart each time.