on the left are the type III
on the right are the m64.
note that the bottom edge of all plates will be cut off so you can ignore the "Bump" in the machining on the m64 as it will be removed by you.
follow this link to an old tutorial. Since then this has been made much easier as the lower rails are in the plates (except left side m64)
7 sets M64 left
3 sets type III /M70