If it's a 3/4" hole, I would get a PVC plug from Home Depot. It will be low profile, easy to paint with Krylon, and easy to remove. Probably about $.35.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
2018 Robalo R180 CC, Yamaha 115
Bitter Gun Owner