The front sprocket nut it's 36mm. Sears has em for something like $6-7. The rear axl i can't remember, but the average socket set goes to 18mm and anything larger you buy seperatly unless you can find a larger set. I never seem to see sets with larger than 18 tho. The socket i use for the axl is an old socket i had that i think was a SAE socket but fits. You might wanna think about getting a digital caliper. they come in extremely handy and can be has for as little as $15, which is what i paid and it's quite accurate. You'll also need one if you do your valve adjustments yourself.
Ok, i just went out and measured the rear axl bolt and it's 24mm.