Just an observation, but changing just one leaf spring can create an unsafe condition when driving.
IMO, best choice is to replace both springs on an axle (front or rear) when there is a need. May be a bit more money, but in my book a safe drive is far better than the alternative.
Just my .02 worth.
Dan
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)