A rwd is totally differant to a 4x4. The problem with the 4x4 is the tie rod end is really close to the brake disc so the bells have to be really shallow bringing the calipers real close to the wheels, hence the problem with smits car (also mine as its 4x4 aswell )

The rwd has quite a large gap between the disc and the tie rod end so deep bells can be used physically moving the caliper away from the wheel. In my old sierra, a 2.0 GLSi, identical to cossie RWD regarding offsets etc. i had a set of 325mm with 4-pots sitting behind a set of BK299's (spokes curve back quite a bit). The calipers were close to the spokes but cleared. The same wheels won't fit on my cossie as they contact the calipers (and their only 308mm discs )

I'm not sure of the design of your alloy but you should be able to fit a set of 325mm discs on there, 335mm discs may be pushing it a bit, you may require spacers. The mo's will definitly allow the fitment of 335mm discs.

I definitly know the above is true, as i've fitted brakes on a rwd and 4x4.

Big brakes rock, planning to get a set of mo's myself to fit a set of 335's.