[RC-Monster Mike]

The new motor mount won't work directly with the old lower plate, either. It would need a spacer where the mount attaches to the x brace. The extra cell is the major change, but the new lower plate also doesn't use the additional aluminum side rails to help locate the batteries, but rather has a bend in th plate itself(lighter weight). Otherwise, they are both compatible with each other. If you don't use a motor mount, the new lower plate will bolt right up.