They are discontinued, they looked cool but too narrow anyway... If you are gonna get rims for a big body like a Mark VIII get 19's or 20's, 17's and 18's are too small these days...
I love my 18's. looks perfect on a lowered mark. If i wanted big rimz id buy a 74 caprice.
I agree completely! 18's fit the M8 perfectly. Many a rim manufacturer and tire shop have told me that you loose performance/handling/ride, once you go beyond 2 inches higher than stock, unless you completely re-due all suspension components. I have seen a couple of 20's that I thought suited the M8, but still looked a bit large for the car, just as most do on other style of cars as well.