Im no expert Dean but i'll have a stab ..
I think the dependant factors are : are the frames to the rear openers in good nick? are they chrome or black? what are the seals like?
I would say the openers are worth more than just the large glass ...
If in good nick i would say about £50 for each opener, assuming good nick ..
The large glass about £20 ish ..
I may be wrong, and know that someone will put me right if im way out .. but thats what i would put them up for if they were mine ..
Hilly