Thanks for all your replies.
I have made a new lamp set for the surefire nitrolon commander nx. My first lamp set is using an s017xa reflector, but I am not very satisfied with the results (beam pictures will be posted some day to you check). So, I have molded the original lamp set in silicone and injecting resin on this I have get a new reflector, specifically made to this surefire. I will post pictures as soon as possible.