I measured rivets I removed and noted those measurements and then what I used to replace them.
cord port & water fill - 1/4 inch head, 1/8 inch dia. shaft, 9/16 inch grip.
Scamp 46 works with butyl tape caulk.
fridge vent (top) - 1/4 inch head, 1/8 inch dia. shaft, 9/16 inch grip.
Scamp 46 works with butyl tape caulk.
belly band - 1/4 inch head, 1/8 inch dia. shaft, 7/16 inch grip. fiberglass seam plus belly band is 3/8 inch but varies a bit. I used Surebonder multi grip which does 3/8 to 1/2 inch grip. Part number FPC4547A-100 in a hundred cnt pack for $5.79 Scamp 46 looks like it might work.
curtain rod bracket on door - old rivets stayed in door so I could not measure. I used scamp 46 it worked.
furnace vent (old style gravity furnace) - 3/8 inch head, 3/16 inch dia. shaft, 9/16 inch grip. I used 5/8 inch store bought, scamp 6-10 or 66 looks like it might be a match.