NORTHRIDGE has those parts...... the front and rear sight, and the rear sight guard.......they don't have a front sight guard, I made mine from a "U" channel piece......actually it's a piece of a book shelf bracket.
http://northridgeinc.com/sp_rpg.htm
as for the rocket........I was looking for 4 years, until I found mine. you can find RPG-2 rockets here with no prblem, but not the 7s......I was seriously thinking about making a cast of mine and reproducing it for the guys who collect ordnance ........but resin is just way too expensive, that it just wouldn't be profitable