> I learned this the hard way too. The ones from the 'skylight guy'
> SUPPOSEDLY are exact replicas, but are not really that exact. I now always
> get the real McCoy from Euro-American RV Products (the company that
supplies
> the parts to VW). He also has the OEM knob you need.

I have the original VW one, the Skylight Guy one, and the single-layer U.S.
made one. Those are the only three out there, so I've had experience with
them all.  I periodically get a call from someone who is having difficulty
making his replacement line up. This happens _very_ infrequently.
Interestingly, some of these people have purchased the original one, others
an aftermarket one.  Some have purchased a gasket from me and not called
back subsequently with further problems, although others seem to have worked
it out without buying a gasket. The complaints have been infrequent enough
and so scattered among the different skylight versions purchased that I have
been unable to identify a cause.  Shrinkage of the gasket over time is one
possibility, or else minor sample to sample variation of the skylights (any
brand), the hole in the roof, or the line up of the flex-arm might be
another.  In any event the problem rate has been low and not severe enough
that anyone has actually returned a skylight due to inability to fit it.

- Ron Salmon
  The Bus Depot, Inc.
  http://www.busdepot.com
  (215) 234-VWVW