Does anyone know the stock thicknes of the spring pads? I need new ones any way and plan to go with a little thicker for the new Vogtland springs. Also, do I need one or two for each spring?

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1985 300D burning WVO using 26 FPHE, half gallon heated fuel filter,glow plug heater,home made injection line heaters. Home made cold air induction. ALDA full out.
2003 F350 7.3(the last of the great motors)
1987 Paint Horse-non running too, just walks!