I don't have any, but there is a guy here in Australia who advertises regularly on ebay that has the backing piece made in cast alloy, rather than in plastic ... which breaks away where the screw fixes it to the body.
His are cast with provision for the lock mechanism too... I haven't bought one yet as both my X's have good plastic parts.
If you need the handles and everything, you just have to keep looking, but in my experience the plastic backing is the bit that breaks.
SteveC