Just double checked.
Extrapolator, you were right, I was trying to give myself an extra inch. Thanks for asking me to look again.
Spring free length from inside to inside the hooks 3-15/16 inch (100mm)
From the eyelet to eyelet (mid to can)
Top 4-7/16 (113mm)
bottom 4-5/16 (110mm)
I'm going to keep looking for some 100mm springs so I only have them stretched 10% and 13%. A 90mm would have to stretched well over the 20% to attach them and even at 113mm is 25% of a 90mm spring.
I've found some 100mm ones made by Moose. I know they're one of the top brands for ATV's, anyone have experience with there products?