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A 9.5 inch wide wheel takes a 255 to 285 tire, and 18x9.5 is the wheel a WRX, Civic Type R, Mustang or M3 goes to for a square set with a 265 tire. Offset decides whether it tucks or pokes.
494 designs on this site come in 18x9.5, and the same diameter comes in 10 other widths, 18x8.5, 18x8 and 18x10.5 among them. Most 18x9.5 designs are drilled for 5x114.3, 5x112 and 5x100. The same 18x9.5 sits three different ways at three offsets, so the number that matters is offset against your fenders and brakes. Pick your car and the page keeps only the sets that clear.