Morris Minor Owners Club

I'm about to fit MG midget disks, I have the hubs, disks, calipers etc, I have the brackets marked out on 10mm plate and will cut them out in January when I have access to oxy-fuel gas. what have others done about back plates? Are they necessary?

The stone guards (back plates) should be retained as they do stop stones getting between the disk and caliper which could lead to deeply scored disks.
Phil