For one reason or another I end up with missing washers on bolts (my fault or can be LBS. They get lost along the way. Although I try not to lose them myself if I know they should be there).

Question is, are they critical if missing (probably not as I’ve ridden for some time without)? I find it hard to get the things or track down the dimensions to find replacements.

Talking pedal and shock bolt type of thin metal washers.