jimgmc's info indicates that the center bolt is exactly centered between the eyes at the ends, so it's possible the spring is installed backwards.
That 41.52 inch measurement could easily be the distance between spring seats.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.