Ok, it was very hard to fins space for that fans, so instead of redesign supports and ducts I've modified the case to be 35x35mm and to accomodate that desing by gudo
https://www.youmagine.com/designs/um2-centrifugal-fans-duct
They fits nicely, only modification to gudo,s work is two small holes in the top center of the fan for the wires.
Just made a prelimiary test, not very bad, sure better than original fan duct, I will update you after more testing!