You may not have to use the same holes/locations. I'm not familiar with your gear but you MIGHT be able to drill a pair of new holes near the existing ones without weakening anything (evaluate first) and tap the plane side for 1/4-20 nylon/plastic screws. Don't worry about installing new blind nuts for them. Plywood will need to be a MINIMUM of 3/16 and 1/4 preferred for a good bite.