I have a 07 530xi wagon and was wondering if 08 550i sedan seats and door panels will fit

 

Yes, the front seats will bolt up and the door panels will fit. Front seat modules may be different depending on the type of seat, so some coding may be needed. The rear sedan seat backs are different than the wagon seat backs, so those are not directly interchangeable. The rear seat bottom is identical. If rear heated seats are involved, I'm not 100% sure, but maybe you can just swap the heating elements?. In order to use the window switches in the LCI panels, you'll need to extend the switch wiring.