Hi Dave, here are a couple of pictures, if they don't help enough let me know I took a bunch of under-dash pictures. Well here is one picture for some reason the BCF wouldn't let me add the 2nd picture. They said the file was too big????
The back of the rails go on to the little shelves on the battery box and the front of the rails hook to the bottom of the dash. Not necessarily a drop in. I really had to fiddle and fight with mine. Make sure the wind shield wiper system is in before you tackle it.
I will try the other picture in a few to see if the system will accept it.
Good luck, Tinkerman