Benelli super 90 M1

Hey guys, I just bought a used M1 for $600 + SW66. It came with an extended mag tube, heat shield, an Aimpoint (later model) sight mounted on an extremely ugly gloss black b-square mount. To top it off, the previous owner took out the rear sight. Can someone point me to where I could find these parts? I also want to get another mount but am not too sure how to take this one off.thanks for the inputSmooth[This message has been edited by smooth_operator (edited 12-03-2001).]