There are (technically) 3 different sized rails.

In a passenger Vanagon there are 2 different lengths, so as to make
sliding in the middle seat a bit easier (get it started on one rail
and then the 2nd rail is pretty straight forward.

However, Westy rails are yet a different size again. (one size for
both of them). This is because, a single seat would potentially only
be on one of the rails (not a good thing).

On Aug 25, 2008, at 1:57 PM, Neil2 wrote:

>  was puzzling over rails this weekend.  Any idea why a Vanagon would
> come
> with two diff length rails?  I think I've seen the same situation with
> several Vanagons and until now never thought about it being strange.