I highly Doubt many folks who would actually "drive" their cars would install NOS spiral shocks.
Ever heard of Delco Pleasurizers?
These were created to replace the 1 way valve piss poor spiral shocks.
The repop spiral shocks are nearly identical ( minus a date stamp) and even have a warning that they suck for daily use.
Technology has been at gas charged dual valve shocks for a while.
Spiral shocks ( same exact part number) were used on a whole lot of GM cars, besides F bodys. I posted the parts manual on this a couple years ago, with highlights.
Spiral shocks, NOS or used are museum pieces, OR just conversation pieces.
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