Lego minifig compatible Custom SI-Dan Toys ANVIS-S2 Night Vision Goggles, clip onto the following SI-Dan Toys Helmets M2002, PT202, BK-1X, IBH, IBHG, ACH, PBH and HGU.

The difference between the Anvis-9 and the Anvis-S2 is that the S2 can swing all the way up touching the helmet.