Roof Bars On 3DR Micra Vibe '96

I know that you can get roof bars for 3 doors where the back windows open, but my rears dont open.

Need a set of roof bars as when there are 5 students going from salford uni to chill factore with 5 snowboards in the back, it gets cramped thats all i will say, and when taking corners and being hit in the head by a £800 snowboard its not cool anymore :D

Can anyone tell me where i can get a set of roof bars, or even if that fails, where i can get a compatible inflatable set.