OK, that makes more sense with your explanation and reading through the instruction website. The 9200 unit you and the article used are more of a stand alone unit and are sort of "rigged" in there as to the mounting to fit into the Parallax case. The 4600 is designed as a direct fit slide in unit just like the original Parallax mounting, even comes with a new mounting sleeve. I would assume the same internals, but I will check with the company on that before I order.
Thanks again for the info.
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