Hey all...

I have a 2000 21SS Extreme and I'm going to Group 29 trolling batteries. The mounting holes on the new battery trays are different than the old ones. Before I seal the old holes & drill some new pilots - I was wondering if anyone knows what's beneath where these sit (port side)? Is it only fiberglass? Or wood? I'm going to use the same length SS screws as the old ones.

Thanks in advance... FH