Beyond going up in rivet or screw size and subsequently larger head, I don't think there is a "fix."
Depending on the thickness of the metal in question and assuming the counter sink is not deeper than the metal, which would enlarge the hole, it may be fine as is if it is not a structural piece.
A call to Van's is probably your safest bet, however.
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Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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