Rick , I just pulled out one of my spare moon roof track/motor setups and took a look at it , from what I see, the glass has to be moved to the rear position as the slider has to come forward to its closed position to start the process, to get the slider to move forward you seem to have to flex the center of the slider down at the front to get the catch part under and in front the glass , the catch is what moves the slider back with the glass when activated.. once you have that catch area pulled in front of the front of the glass , the slider now can be slid forward then eventually up and out the moon roof port in the sheet metal of the roof, what will happen is the front section of the slider can be lifted up ,then once it is at a bit of an angle to the roof line then one of the back sliders corners can be moved forward to let it out of its track, its a pretty small metal channel type clip , so the angle does not have to be that much to pop it off the track at that point move the slider off the track and take the slider out the top .
** Note ** at the very beginning, right after you move the glass back to start the process you will have to take a look at the top side mounting tracks on either side and what they are holding and what will be in the way of the slider when bringing it forward and up .
My moon roof units here are partially taken apart so not sure what is there and everything I have just said is based on what I see here, I was able to get the slider out easily doing what I just said , but you will have to observe the top track parts with the many screws holding it all down to figure out what needs to be removed without dropping the whole moon roof rack ... but in the long run you may want to remove it anyway to keep as back up parts .
Either way ,I hope this made some sense , good luck with it .
I will be going to pull the moonroof sliding insert from a parts car. Do I need to power the moonroof in order to get to the point I can get the insert out (it is in the closed position and I can remove the headliner if necessary).