Have you tried going to Tirerack.com and searching through their inventory of 18in tires? That's the only place I can think where you can look through many different brands to see what aspect ratio are available. Just how thick of a tire are you wanting? Good luck. It's a good look on the right car.
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Trey
Current rides: 2001 BMW 540iT soon to be manual swapped and 86 C10.
Former ride: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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