I scanned this "Leaf Spring Dimensions" list from the NPD catalog. I thought it might be useful to someone looking to replace their stock springs with something heavier or looking for a little extra lift. Since the listing shows the free-arch dimensions and eye-to-eye dimensions, once someone knows the specs of what they currently have, it should be easier to find the spring they want.
I tried to scan to PDF, but my software seems to just do JPG. But it does look clear viewing on my computer. If this is useful, you may want to put it on the page where the Spring p/n are provided.Ford_Leaf_Spring_dimensions.jpg
1982 F250 4x4 XLT Lariat, 460cid, 9.5:1, TFS 290 Street Port heads, Crane Hyd. Roller cam (278/286 adv.,216/224 @.050, .560"/.586" lift), Edelbrock Performer 460 intake, MSD Atomic TBI fuel injection, MSD 6AL ignition, MSD Billet distrib., Hedman headers, NOS Cheater system, 4" Suspension lift, 3" body lift, 4.56 gearing, 17x12.5Rx37 tires MT Baja ATZ-P3.