Clem has the same width and offset on the rear as I have suggested and they work fine.
As for the front I. Any see it would be any issue as 34ET is about 10mm less than standard, a lot of after market wheels are under 25 making them sit closer to the outside of the bus (widening the track).
I had the chrome and it failed very quickly I believe that BBT have stopped doing the chrome now.
jK sell the painted ones I think cool air do also not sure if T2D still do.
IMO the alloy ones have all the wrong profile of the edge at of the spikes and rims and just don't look right.
Mid you do get BBT check the finish on them thoroughly before fitting them as I can be a bit poor.