determining which coils to purchase

A quick learner from Missouri says:
I do know that I need 15-199 pivot shoes, I do know that I need Series 165 coils, but I dont know the balance....please help me.

Based upon what I have learned from your experts, I think in a lot of my cases it is just the coil cover/retainer that has dry rotted, and the coils and shoes are fine. Which cover should I purchase for the dual coils.
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Lauren from SWISCO responded:

Hello, thank you for posting! 

If you have already determined that you have the Series 165 coil springs that have a 3/8" thickness, please review the 15-204 dual support cover. Please let me know if you have any additional questions. 

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