Hi I used to sell wheels and got out of it for a few years now. Recently I bought some Rotas (18x9.5 and 18x11) I had that problem on my mustang when I went with rotas as well. Rota Dealer in NZ explained his wheels come in different blocks off offsets and he can order them machined down to achieve a offset. So they take something that is a Zero offset and they shave the back off until they get to +25. As well u can get a wheel that's a +20 and they shave it down to get a +45. That reduces the amount of castings they produce. So you might have had a different block that was machined alot and then the centercap stick out (like in my mustang) When you look at thoes mass produced wheels they have a huge block of material where the face hits the wheel, they shave that down to get a specific offset. Was a pain in the ass because I had to grind down some of the axle hub on my mustang to get them to sit flush. There was no more material left over to machine. If I had the money I would have put CCW's or HRE's or Simmon's as they are made to order. As always you get what you pay for.
