Is the axle on a G3 the shaft should be 52" wide they should fit with out any problems as mine was ok with 7" rims without arches. If it is on a mk2 with mote arches they should also fit as I use to run a f.f. atlas with 20/53/13 on it without any problems with forest arches.

Measure your drive shafts to see what the length is. Also measure the offset on the wheels that fit ie. how far from the rim is the back face of the center that bolts to the hub.