Leaf Spring lengths????

[Mustard72]

I bought a C20 leaf spring frame from a local junk yard. The springs are both different (8 and 9 leafs, plus two helpers, plus the left one is just messed up, plus the clamps have all been cut apart, etc. etc.) Both of these leaf springs appear to be 24" from the front eye to the center bolt, and 28" from the center bolt to the rear eye. I assume that lenght is correct, although the truck the frame came from in the yard didn't have a bed left on it, so maybe the springs were swapped at some point and they changed the wheelbase (flatbed???). I've shopped around on line for springs and they appear to come in both 24" and 26" lengths for the front eye to center bolt measurements. I don't see how changing this length can't change the wheelbase. So which is correct???