VW T4 Topaz Van Cover - In search of......

Hello folks,

After some recommendations for a cover to fit a VW T4 Topaz. Due to the high fibreglass roof, normal covers don’t fit.

I’ve done some digging around but not found any that actually fit, always seems a compromise.

Can anyone recommend a company or a cover that you’re currently using? 

I need it fairly quick as I’ve got to take out a side window for a few ok thanks and need the thing as water tight as possible. 

Thanks in advance.