Well, if you have the game, there is one part that can really help you to figure out the helmet. Even though its digital, the cut scenes between the final confronatation between you and montross, it shows him putting on the helm for the first time in the game. If I recall from memory, his was green with red mandibles, but I may be wrong, could have been blue mandilbes. Also, if the Bounty Hunter version helm is the same as the open seasons helm, there is a an excellent pic of Montross's helm closeup in the sequences if him flying away, where he leaves Jaster on the battlefield. Hope those sources help.
-tubachris