I use the schoeps WMS windscreen for the ak40/ak20 combo...Neumann does not make a windscreen that fits the active style neumann setup, but the schoeps works just fine...I also use the schoeps WB windscreen for blumlein for same reasons
as for the m/s mount I do have a neumann sth120 mount...very pricey at around 220...I would suggest looking into the schoeps m/s mount which retails for around 150 and will work just as good as the neumann