The rear wheel arch is the same, but I'm not going to tell you that the inside fender is identical between sedan and wagon. I think the inner and outer halves of the wheelwell are the same, with extra (different) structure welded above and between them.

The spare tire wells should work as well, but the very rear of the valance panels are different, and there might be some trimming involved. The sedan pieces, or sections cut from a healthier later model junk will work to fix the part that usually rots out on the 245, which is the junction of the spare tire well seam and the front edge of the quarter behind the rear wheel.
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Rob Bareiss, New London CT ::: 87 244DL- 249K, 88 245DL- 181K, 84 242DL, 89 244DL parts, SOLD: 86 244, 88 244GL, 87 244, 91 244, 82 245T, 88 744GLE, 86 244