My drum came with a flat lid and no 2" bung. I went with 8 1/2" holes, and it works very well for me. I bought some circle magnets at Menards and use them to cover the holes. Works like a charm and sure looks ugly! See the attached pictures... one with the holes covered, and one without.
Matt - 18.5" WSM; UDS; DigiQ DX2; Commercial Series Gasser; Maverick; Some Other Crap, Too!