Tasca Ford Coils...

[MADRODER]

I did a check at Taska's parts list online and found that there is a rear coil available ?? can anyone let me know what the differences are for the three listed parts. It shows part # 3W7Z-5560-CA as available ??
(http://www.tascaparts.com/mercury/marauder/3w7z5560ca/2003-year/base-trim/4-6l-v8-gas-engine/suspension-cat/suspension-springs-and-related-components-scat/?part_name=coil-spring)

3W7Z-5560-AA (http://www.tascaparts.com/mercury/marauder/3w7z5560aa/2003-year/base-trim/4-6l-v8-gas-engine/suspension-cat/suspension-springs-and-related-components-scat/?part_name=coil-spring) Coil Spring, Rear (http://www.tascaparts.com/mercury/marauder/3w7z5560aa/2003-year/base-trim/4-6l-v8-gas-engine/suspension-cat/suspension-springs-and-related-components-scat/?part_name=coil-spring) Suspension Code:A; Stamped #AW
- Not available
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3W7Z-5560-BA (http://www.tascaparts.com/mercury/marauder/3w7z5560ba/2003-year/base-trim/4-6l-v8-gas-engine/suspension-cat/suspension-springs-and-related-components-scat/?part_name=coil-spring) Coil Spring, Rear (http://www.tascaparts.com/mercury/marauder/3w7z5560ba/2003-year/base-trim/4-6l-v8-gas-engine/suspension-cat/suspension-springs-and-related-components-scat/?part_name=coil-spring) Suspension Code:B; Stamped #CPG not available

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3W7Z-5560-CA (http://www.tascaparts.com/mercury/marauder/3w7z5560ca/2003-year/base-trim/4-6l-v8-gas-engine/suspension-cat/suspension-springs-and-related-components-scat/?part_name=coil-spring) Coil Spring, Rear (http://www.tascaparts.com/mercury/marauder/3w7z5560ca/2003-year/base-trim/4-6l-v8-gas-engine/suspension-cat/suspension-springs-and-related-components-scat/?part_name=coil-spring) Suspension Code:D; Stamped #DMV