I got some Archers rivets a while back when I was building locomotives, I got sheet AR88001 which is a general purpose set. They are nice but I think they are a bit small as a representation of the mighty fastenings the Victorians used. Mostly I have used the largest on the sheet, 0.36mm, the others are tiny.
If I was starting again I would probably get sheet AR88009. Ideally I would have both:
AR88001 - 0.008" (0.20mm), 0.011" (0.28mm), 0.014" (0.36mm)
AR88009 - 0.015" (0.38mm), 0.025" (0.64mm), 0.035" (0.89mm)