Nuprol products are all just rebrands of normal ACM stuff which WE Europe have got RoHS certified and had a CE mark put on. They're in no way connected to WE from a manufacturing point of view.
I have a IMI Holster for my WE Glock, fits great. You need to get the IMI Holster model for the RS Glocks 20/21/37/38 in order for it to fit the WE 17 Glock correctly. Great accessories for it to