Yes they have extra as they are trim to fit. 6"+ overhang per side does seem like alot of extra material tho & maybe that # fits several apps. I'd check the # & continue on. I've only did one (65 dart) & my advice is to be patient & dont be afraid to walk away when a slight snag develops (pun intended & yes it will) & come back the next day especially if it is your first one and you'll likely need to walk away several times. The concept looks simple but they ain't easy. I've developed alot of of patience thru the years for things mechanical & rarely get rattled in the shop/garage but that headliner tested me