What year is the clutch?
They made 3 types; early 6 disc without spring loaded boss, 7 disc without spring loaded boss, then finally back to 6 disc w the spring loaded boss. You have either the 7 disc or the late model 6 unless you have an early model XS. None of this really matters unless you're jamming 7 plates in a 6 plate unit. I don't see how you wouldn't catch this though....
Here's the order of the hardware. Often times people get the first two washers to go on backwards. The smaller one w the red dot is the first bit to go on the motor when reinstalling the clutch:
Once all that's on the clutch nut gets torqued to 55lbs. You'll need a holding tool to R/R the clutch.
Do you have a complete understanding as to how the clutch works? The outer basket will not spin freely since it meshes to the crank. The inner boss spins freely provided the bike is in neutral. If you have the plugs in, forget trying to sping the outer basket by hand at all.
Also remember to line up the dots on the clutch boss and the pressure plate: