here's thanking you in advance. I just bought an 05 pluriel, and all was well until the garage man tried to force the roof open

Anyhow it is now hanging down from pretty much half way along the car, it looks like some of the slider bows have been broken.
I am at a loss as to how to attack this task, I called citroen for a price on the slider packs and they want £110 per side (inc vat)
So I guess what I am asking is
is there anywhere cheaper to buy the sliders, ?
are they all the same part or different (front to back)?
are they right and left handed?
and what is the best way to tackle the job and get it back together? I haven't tried operating the roof at all, didn't want to attempt it.
Apologies for such a shopping list on my first post

thanks again