With your hip problem, what are you looking for in a new seat? Something less confining, without side bolsters, or wider and comfier in general? I'm presuming you aren't wanting anything confining like a racing style seat. Would a standard Contour bucket seat, which should be a drop-in replacement work better for you?

-Mark- '99 Mystique LS, totally original (including the original water pump and the premium stereo)! Bought new in December 1998 for $21,000. 208,000 miles