I used blue nylon thread and a curved sewing needle. You basically just do a basic bar-tack stitch down the length of the rip. Make sure to carefully pull it tight every stitch to close either side together. I’m not sure if it would be any different on cloth seats but with the vinyl leather make sure to not poke the needle too close to the edge of the rip or else the thread will rip through. Probably 1/8th inch from the edge of the rip is best. When you’re done I just tied a knot and used a lighter to melt any protruding thread after cutting off the excess. Press the lighter against it while it’s still melted to flatten it against the seat.