I'm rolling on 235/40/18s its the best thing i ever did it makes the car feel the road more and less like being in a boat I'm using 20mm spacers all round and that makes for a better look there is no rubbing on these either but the spacers where needed to stop rubbing on the dampers
![Thumbs Up! :y](http://images.omegaowners.com/forum/smf2000/Smileys/oofstd/thumbsup.gif)
to have some custom precision machining done will cost you i work for an engineering company that make parts for the weapon systems on the euro fighter so i cant help you there as the cnc machines are all pre set programs running
if you do go for custom go to a small local machine shop and see if they will who knows you may be lucky
especially if you have all dimensions finish and tolerances drawn up of what you want and the material to be used it will need to be more than just a quick sketch on a note pad though