I need the exact size for front & back to fit the scope?

The number after the letter refers to the size of the objective lens. So the O-40 would work on anything with a 40mm, O-44 would be the 44mm etc... The Eyepiece should fit just about all eyepieces.

Will this fit on the eyepiece of a vortex viper pst 6x24x50?

Mine does NOT. It fits snugly over my 6-24x50 PST eyepiece, but the rubber runs into the first knob before it slides all the way on. Worse yet, the cap simply will not stay closed, which negates the whole point of having a cap. I will return this one and try a different cap.

What size caps would i need for a vortex viper pst gen II 1-6x24?

According to vortex website sizes E-10 and O-24

Is this just one cap or for both ends

This would be just one cap . Usually each end requires a different size.

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Description

🔭 Elevate Your Aim with the Ultimate Flip Cap!

PERFECT FIT - Designed for a range of Vortex riflescopes.
LIFETIME WARRANTY - Enjoy peace of mind with an unlimited, unconditional warranty.
LIGHTWEIGHT DESIGN - Weighs only 1.4 ounces for easy handling.
UNMATCHED DURABILITY - Virtually indestructible, built to last a lifetime.
VERSATILE FUNCTIONALITY - Flips into multiple stop positions for optimal use.

The Vortex Optics Defender Riflescope Flip Cap (O-56) is a robust and versatile lens cover designed for 56mm objective lenses. With a stainless steel spring mechanism that allows for multiple stop positions, this cap is engineered for durability and ease of use. Weighing just 1.4 ounces and made in the USA, it fits a variety of Vortex riflescopes and comes with an unlimited lifetime warranty, ensuring it’s the last flip cap you’ll ever need.

Specifications

Brand	Vortex
Color	Black
Style	O-56 (62-66 mm)
Item Dimensions LxWxH	7 x 5.3 x 1.65 inches
Sport	Hunting
Item Weight	1.4 Ounces
Material	Aluminum
Objective Lens Diameter	56 Millimeters
Magnification Minimum	2.4
Compatible Devices	Rifle
Mounting Type	Side Mount
Night vision	No
Item Package Dimensions L x W x H	6.9 x 3.7 x 1.5 inches
Package Weight	0.08 Kilograms
Brand Name	Vortex
Warranty Description	Unlimited, unconditional lifetime warranty.
Model Name	Riflescope Accessories
Suggested Users	Unisex-adult
Number of Items	1
Manufacturer	Vortex Optics
Part Number	O-56
Model Year	2015
Included Components	Accessories
Size	56mm Objective Lens (O-56)

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