WHEN WE SAT IN OUR BUCKET SEAT WITH THE RUNNERS SITTING FLUSH TO THE FLOOR. THE SEAT BASE WAS TOO FLAT GIVING NO SUPPORT UNDER THE DRIVERS LEGS. AFTER A LITTLE MEASURING WE DECIDED THAT EXTENDING THE FRONT MOUNT PLATE OF THE RUNNER WHERE IT BOLTED TO THE SEAT BASE BY 1" WOULD SOLVE THE PROBLEM. WE FABRICATED A COUPLE PLATES FOR THE JOB AND USED A QUICKLY MADE JIG TO MAKE SURE THE BOLT HOLES ALL LINED UP WHEN THE MODIFIED RUNNERS WERE REFITTED TO THE BASE.