It's been surprisingly difficult to find a source for bolt spacers, the kind used to correct fender lines and space racks or fender stays with M5 bolts. Rivendell's fender installation video (at 3:15) shows an assortment, but my local shop pointed me to misc pieces and my hardware store only had 3cm spacers. I can only find washers and 5mm "bottle cage spacers" online. Anyone know a good source for these? Am I even using the correct nomenclature?

I really don't want to try to hacksaw longer spacers.