I had the same problem with summit/centerline like 5 years back. I remember getting my front wheels fairly quick and the rear ones took months. The car was no where near done at the time so didn't bother me but remember being on the phone getting the run around. At some point I thought they would never show up.
But finding 15 inch 5x4 with the wheel size I wanted was worth the wait. Wheels are nice and still look new to this day. Just keep them polished.
