Good write up, I replaced mine today on my 2002 4.6is with 192K miles on them, left side was leaking down overnight. Bought the Arnott sport springs on Ebay for $99 each, install went without a hitch, easy as heck.

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2002 X5 4.6is
1999 C5 Corvette
1992 Mitsubishi 3000GT VR-4
1994 Kawasaki ZX-9R
2005 Mazda 6 Wagon (Wife's)
1991 Mitsubishi 3000GT VR-4