Im pretty sure all alumina scope covers screw in, they dont slip on
If you have a VX-3i 6.5-20x50 that is threaded for the sunshades and flip caps, you will use MPN: 62995.
I own three Leupold scopes. Whenever I have a question about them, I call Leupold. their customer service is excellent and you will get the right answer about fitment for your particular scope.
The Leupold Alumina Flip Back Objective and Eyepiece Lens Cover Set you need for that scope is model number 62990.
For that scope you will need the Leupold Alumina Flip Back Objective and Eyepiece Lens Cover Set model number 62990.
For the Leupold Mark 3HD 3-9x40mm scope you will need Leupold Alumina Flip Back Objective and Eyepiece Lens Cover Set model #62990.
For that scope you would need model 62995 of the Leupold Alumina Flip Back Objective and Eyepiece Lens Cover Sets.
This depends on what specific model of that scope you are talking about. You can use the sizing chart on the left side of the product page to determine which Leupold Alumina Flip Back Objective and Eyepiece Lens Cover Sets fit your scope.
These Leupold Alumina Flip Back Objective and Eyepiece Lens Cover Sets are MPN: 62990 and MPN: 62995
Code: LU-R2-COLM-59060
MPN: 59060
UPC: 030317590604