Sure guys, you're really lucky. McMaster Carr is the place to go for that type of hardware.
http://www.mcmaster.com/But they SHUT out Canucks! No more shipping ot Canada
I ship 'em with mine of course and I also have these cool nuts that slip over the lip of a chassis called G-Nuts (Part Number: 90542A343 ) . I'd ship you some but I cant spare them as they are hard to get hold of up here at a reasonable price.
Here's the McMaster Carr details:
Steel — Zinc-Plated Finish
.064"-.105" Part # 90680A126 7.59 per Pack of 25
I'd buy any extras off anyone who had them.