VEVOR Diamond-Plate Rubber Flooring Roll, 3 mm x 4 ft x 6 ft Garage Floor Mat, SBR Rubber Garage Flooring Roll, Easy to Clean, Diamond Plate Rubber Mat for Under Cars, Garage Industry Gym, Black

This will take about 6 or 7 mats. If you have 6 mats, there will be some gaps on both sides. If you have 7 mats, you can cut the last mat into strips to fill the gaps.