What is the length of these springs?

The retracted length is 26 1/2 inches, tip to tip. I would imagine that is the standard length of all such garage door springs, but not sure. The important thing when ordering is to get the correct springs for your door weight. My old springs were green on the end, so that told me that they were 120 lb. springs and that is what I ordered for replacements.

What is the outside diameter of the springs?

The outside diameter is 1.73inch

How far is the extended length of the springs

68 inches fully extended, garage door down..

Other manufacturers have a 1.5 outer diameter for 140lbs 7ft doors, is this ok or is it supposed to be standardized ?

shouldn't be a problem on a alum,door

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Specifications

Manufacturer	ZhenT
Part Number	ZT-054-1
Item Weight	4.29 pounds
Product Dimensions	2.7 x 7 x 13.1 inches
Country of Origin	China
Item model number	ZT-054-1
Size	90lb
Color	Black
Finish	Coated
Item Package Quantity	1
Included Components	1 Pair of Garage Door Extension Spring and 1 Installiation Instruction
Batteries Included?	No
Batteries Required?	No
Warranty Description	3 year warranty

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Heavy Duty Replacement Extension Garage Door Spring Stretch Spring 2 Pack 90 Pounds

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