I've owned BOTH the WS80's[fur-covered] and the WST50's[black ballistic nylon], and so far, I MUCH prefer the all-black WST50's IMO! The fur is a PITA to deal with and gets EVERYWHERE, while the WST50's are fur-less and all black taboot!
Just get the 3cm WST50's and be done with it. I PROMISE that they will work great for you. The WST50's have an inside depth of 2" according to the Movo WST50 boxes that came with my screens
That said, if you're interested in some WS80's[fur-covered, which are the IDENTICAL same size as my WST50's FWIW], hit me up! I'll sell you some WS80's for cheaper than new