I would think a spring assortment from the "Help!" Brand (dorman) may have a spring that is the same size . Even a mom and pop hardware store may be able to help. Bring in the drivers side spring and have them match it.
Just an idea...
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===Always trying to find time to work on cars===
Louis Duet
Baldwin, Long Island, NY
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"Blue" <= '85 Fiero GT
3800sc series 2 swap in progress
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"Boo" <= '81 Delorean DMC-12
VIN #5835
Stock PRV engine
Peugot 604 Intake manifold
Exhaust headers
Anti-3rd brake light