The newer XFG and XRG/T wheels use a new model of wheel and texture that can`t really be customised like the older wheels on the RB, LX, etc. It is really just a plain style road wheel where the texture is tiled, rather than fully skinned.
The good old road wheel on the LX, etc pre-patch Z was almost perfect for skinning until a hideous reflection was added to the centre dome which made all the properly skinned wheels redundant. Most people making custom wheels stopped working on them after this happened, as the results were always going to look crap.
Some people have done .vob mods to the cars, to get the old steering wheel back, amongst other things, but it`s probably not the best subject to be talking about on this forum.