So obviously the inner front apron, where the battery tray bolts in, has had an old repair patch overlay; a temporary fix at best. Rust to the apron is very common in that location due to battery fluid spill causing corrosion which eats it's way through the steel tray & eventually down through the apron. I've had to repair or replace these on both my 67's. Easily fixed, access is good, the apron panel is simply drilled off, a new one welded in & painted, & a new battery tray bolted on.