I don't have dimensions marked on the photo but you can see a clear view of
the sliding door contact switch on my site out at

http://www.weidefamily.net/vanagon/Pending_Content/Electrical/DomeLightNotes
/DomeLightDefeat/IMG_1248.JPG

Please make sure that you paste the entire url into your address field.

Thanks,
Brent

http://www.weidefamily.net/vanagon/