Yes you do have the holster with the belt if you have the ammo pouches instead of the drop boxes, the holster is always required.
There is an option for the shoulder ammo pouch as well, however, you must have the shoulder pauldron and you must have the drop boxes. This aligns with the recent Kenner toy that was released last year and is a fun option!
I also second @Allan1313 as my shadow stormtrooper is an Anovos and pretty easy to convert over to the Specialist. From first glance on the helmet it looks like it already meets the L2 requirements as the biggest thing with Anovos was the mesh (a super easy change out anyways) and initially they had the narrow mesh, but the later waves had the wide-mesh and that's what yours is.