rubber grommets

Please help...
Gotta drill a hole in the belly pan of the bike about 20-25mm in size to meet GCR's...now l know how to drill the hole but you guys got any suggestions as to where l would get some blank grommets to fit the 20-25mm hole??
Any info is appreciated!!!
Gotta drill a hole in the belly pan of the bike about 20-25mm in size to meet GCR's...now l know how to drill the hole but you guys got any suggestions as to where l would get some blank grommets to fit the 20-25mm hole??
Any info is appreciated!!!
