I just picked up a pair of 250Ti Limited Edition in fair condition. The 108H midbass drivers had discolored dustcap, looks a little brownish, but then the surrounds are stiff accordian type instead of foam surrounds. Has anyone seen a 108H that did not have the foam surround? I have not pulled the driver to see exactly what part number it has, but all my search showed that the 108H had foam surrounds. TIA...