I just trimmed with a palm sander. I tried different ways and this seemed to worked the best. And yes, you have to drill a slightly bigger hole for the metric screw. I installed them "terminals down". I also just cut the old connector off and screwed the wire directly to the terminal but a better way would be to have some kind of pin connector. I didn't use any batting in the cavity but I did put on the foam they came with for the seating area. Also I re-hooked up the original tweeters in the speaker grill which I guess is optional.