Hello. I have been away from this forum for awhile. I just saw the ad in Police Magazine about the Streamlight SL-20XP/LED. You guys have probably already talked about it up and down. Anyway, can I just get this lamp assembly and put in my old metal SL? I assume I cannot because you would need two switches. Also, has anyone heard about a mmetal SL-20X/LED coming out? I am not a big fan of cheap plastic lights for police work.