Your part equivalent to CR Laurence

A home owner from Colorado says:
I need a 27" Channel Sash Balance with parts that are the same as CR Laurence #FA2640 and FS291B kit. I've found your 15-004 boot that has the same dimensions but has wings and I don't know enough to know if the wings would cause an issue. Not sure that I need the heavy duty one I don't think our windows are that heavy, that's just what we ordered last. These sashes seem to constantly break.
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Tom from SWISCO responded:
Wings help stabilize the balance in the jamb track, should the jamb track be too wide. If your old shoe does not have wings, how about our 15-001, instead? If you want, you can take pictures of your hardware and we can work from there.
A quick learner says:
I took one to a local window company and they ordered without wings but we just pulled one of the originals and they do have the wings. Thank you, perhaps that's why we've had non-stop trouble with them. I'll order with wings.
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