Which coil to purchase?

A quick learner says:
I wanted to know which coil to should purchase. I'm not sure which one would be the same size
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Bob from SWISCO responded:

Thanks for writing in. Judging from the stamp number and the design of the coil spring, I believe this is either a S160-4 or S160-5. The Series 160 is 1/2" wide, whereas the Series 165 is 3/8" wide. Check the width of your old coil spring to see which it matches with. 

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