Wind deflector question!

[Whippy]

I have the mesh grilles for the head rests, I have the roll bar loop surrounds to take the deflector, I have the clip locators, I don't have the clips and I don't have the actual deflector on my car...

If I buy a pair of clips and a spurious Perspex from eBay (the seller says his plastic board does not come with the surrounds or the clips) will it slot into place with what I have? Or is there some sort of surround that goes around the actual Perspex before you offer it to the trim between the head rests?

Sorry for the vague question, I just don't really know what I need to go and buy!

Thanks