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

🛡️ Flip with Confidence — The Last Cap You'll Ever Need!

PRECISION FLIP CONTROL - Multiple stop positions at 45° and 90° keep your line of sight clear and your scope ready for action without fumbling.
SLEEK TACTICAL BLACK FINISH - Professional matte black styling complements your gear with a low-profile, no-nonsense look.
LIFETIME CONFIDENCE GUARANTEE - Backed by an unlimited, unconditional warranty, ensuring your investment is protected for life.
UNBREAKABLE ARMOR FOR YOUR OPTICS - Engineered with rugged aluminum and a stainless steel spring, these caps survive the harshest conditions so you never lose sight.
UNIVERSAL FIT ULTIMATE VERSATILITY - Designed to snugly fit 56mm objective lenses across a wide range of Vortex riflescopes—one cap to rule them all.

The Vortex Optics Defender Riflescope Flip Caps combine military-grade durability with precision engineering, featuring a stainless steel spring for multiple secure flip positions and a universal fit for 56mm objective lenses. Made in the USA and backed by an unlimited lifetime warranty, these caps are designed to protect your optics and keep you mission-ready without compromise.

Specifications

Brand	Vortex
Color	Black
Style	56mm Objective Lens (O-56)
Sport	Hunting
Item Weight	1.4 Ounces
Material	Aluminum
Magnification Maximum	1
Objective Lens Diameter	56 Millimeters
Magnification Minimum	2.4
Compatible Devices	Rifle
Mounting Type	Side Mount
Night vision	No
Model Name	Riflescope Accessories
Manufacturer	Vortex Optics
UPC	875874005907
Global Trade Identification Number	00875874005907
Item Package Dimensions L x W x H	6.97 x 3.86 x 1.69 inches
Package Weight	0.06 Kilograms
Item Dimensions LxWxH	7 x 5.3 x 1.65 inches
Brand Name	Vortex
Warranty Description	Unlimited, unconditional lifetime warranty.
Suggested Users	unisex-adult
Number of Items	1
Part Number	O-56
Model Year	2015
Included Components	Accessories
Size	56mm Objective Lens (O-56)

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