Try your local hardware/DIY stores, living in America you should be able to find a a nice dark face sheild or indeed a green one if that is your preference
The DP 96 is a mixture of both the ESB and ROTJ. ESB has the yellow kill stripes, but the ROTJ bucket has the silver ear pieces, etc. You would want to repaint it if you want a good ESB. Do a search for the rouge studios tutorial here on the boards. It will help out a LOT.
I agree, the green looks fine. Also you can make your own template first from paper to get it right. Then when you have it how you like it, trace that onto your visor.