Just finished fitting a pair of Threedogs recovery hooks to my GU IV 4.2 tdi with a Nissan winch bar.
The Bull bar mounting bracket required some trimming with the angle grinder and the bolt hole through the tie down point needed a bit of reeming.
I used 50mm M12 high tensile (8.8) bolts 1.25 thread, got them from Repco, but Bunnings or any other hardware shop should have them. The original M12 (8.8) bolts are only 35mm long, not long enough. All up about 40 minutes for this old phart to fit. The two forward bolts screw into captive nuts, the bolt through the tie down hole (rear bottom) has a nut and big washers.
