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The HO cars with the most oversized "rivets" that I can recall is the
JC passenger car kits.
Athearn's gondola is a close second. You could use those ribs in O
Remember the fantastic cars that Richard Hendrickson kitbashed from
those klunky gondolas? Talk about making lemonade.
Compare the ribs and rivets on those gons to the ones on Athearns 2
bay, ribbed hoppers. They should be about the same size.
Sometimes leaving rivets off HO models (or representing them with
printing) isn't too inaccurate.