I'm looking to buy pop rivets to do some gutter replacements, but the smallest "advertised for gutter work" pack available was a 100pk. I'd probably only need 20 at the most (short span). There weren't any dimensions listed, but common sense says they would only need to be around 1/8" x 1/4". Assuming any substitutes should also be aluminum.
What size would be adequate for joining aluminum gutters?