I'm making renovations or repairs to a 2002 EZGO Txt. I have replaced the battery rack with an aluminum one and installed a new set of batteries. Installed new HD front springs yesterday and will install the rear ones next week when the bushings are delivered. Working on replacing the plywood seat backs today. Are the holes in the seat back and bottom necessary? I am guessing it's for airflow and or drying out if moisture gets in there. They didn't keep black stuff from growing in there on the old ones.