I made a diff guard for the truck today - I did this with some 6mm angle iron - some 4mm Aluminum tread plate - i cut half way through the  angle. Then I drilled two holes in the front side of the angle to attach it to the wish bone bolts - and drilled through the bottom to bolt the tread plate to. On the crossmember the are two threaded holes - i drilled through the tread plate and screwed it through the holes...