im assuming he was giving dimensions from memory, but i could be wrong. no offence to op if those are the actual dimensions. i got that same part number and it matches the dimensions listed by crl.
this window is designed to go right behind front driver door and fits in the spot (imho) perfectly. well as perfect as an aftermarket window will fit in that spot anyways, lol.
i did a little writeup on my install in my build thread in the ground up builds