[ksafin]

I'm pretty sure this affected all WCP gearboxes, unless I'm overlooking something.

We personally didn't even use the wave washers because we didn't have a bearing on the front transmission plate of the gearboxes, because we had a bearing on the VersaBlock and didn't want to overconstrain the shaft.

So that's for wave washer.

As for spacers, Andrew is right - there's extras, and there's some that are missing. The spacing honestly isn't do-or-die. Just make some effort to space your gears out (even that isn't too big of a deal) and make sure they mesh well.