Check with a local spring shop if you have one, or are close to an area that does. One spring shouldn't be to much if you do the work. Or as mentioned grab a set from a wrecking yard, shouldn't be more than about $30/set.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed