no mate..... As far as I know all vans could be ordered from the factory with side windows right up to and including WB. The windows in my HJ and HX are factory installed and the windows in Rod and Jennie's HZ were factory installed... All are the same size and interchangeable throughout the models. You can tell factory windows by the size and positioning in the panel.
non factory tend to be a taller window and don't look as good in my opinion.
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