Leupold link towards bottom of page under Aluminia 50ft adapter. Part number 523353
Ok for Feb 2004 onwards including VX3. Pre Feb 2004 ie Vari X 3 need to have front bell thread replaced.
Option is to use a Leupold fit Killflash
known as an ARD
,94222,132619 these screw directly onto the front bell and cut the light down approx 19% + all the benefits of a sunshade without the lengh. Heard conflicting reports on the cheap equivalents from elsewhere.