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Not sure where you looked, I have found 4 places that sell them in 35mm offset in an hour. I am interested in 18x7.5 and that is the offset called for.
I am still looking into the limits on width. I have found that ADR makes a 8.5 in the correct offset BUT still need to find how fat I can go without modification.
You shouldn't need much modification w/ 8.5 I know someone running 19x8.5 (i think) Racing Dynamics rims on a completely AMAZING 330 (look for it in European Magazine soon...). It basically looks just like the new ppi 330 that you can buy.