Which coil to purchase?

A quick learner says:
July 5, 2019
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:
July 9, 2019

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. 
4.5 lbs Series 160 Coil Balance
4.5 lbs Series 160 Coil Balance
S160-04
$4.50
4 lb Series 165 Egress Coil Balance
4 lb Series 165 Egress Coil Balance
S165-4
$4.70
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