I tried to install my new skylight (the aftermarket, single layer) last night and it does not fit well.  It is real tight on the front edge making closing very hard (like I will strip the crank threads) and the lens does not contact the rubber weather strip on the rear (of the bus) side or corners.  I  pushed  the cover as far forward as it would go but it is not enough.  Any one have problems with the fit?  Did you look to see if it contacts the weather strip?  And I saw a tread about the white wheels which come with them but never saw an answer....what are they ? spacers to alter the fit?