HI Hamrooter, by now I'm sure you will have sorted this problem, but if you haven't, you will have to remove the frame from the body to replace the sliding glass. There is a screw at the bottom of the divider in the middle of the frame which holds the top and bottom together and there is no way to fit the new glass without removing that divider. Good luck. I have that window available if you need it.
Thanks sails58, yes took it to get fixed by someone who told me you could install it with the frame in the body, but turns out he couldn't, so we ended up doing it like you say. Thanks for the reply all done