Replying to Sony HDR-SR12 Lens Help

So i'm looking into purchasing an fisheye lens for my Sony HDR-SR12. The one i'm looking into is in the link below. I think my UV filter on my camera is a 37 mm because it says V-37 on it. Also the numbers that I see when i take off the filter go as followed.1,8/4,9-58,8
So should i get the 37mm one? Or what size is supposed to go on it.

http://opteka.com/optekaplatinumseries37mm03xhdultrafisheyelensforprofessionalvideocamcorders.aspx