what about adding a leaf from another spring pack ? just throwing something out there to consider.  Might have to if we can't find new ones. This car was just put back on the road and after driving it a little bit, we've realized just how much the original springs have sagged.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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