Spiral Balance 5/8" diameter 21" length

A home owner from Norfolk, Virginia says:
I'm looking to replace my spiral balances on my tilt sash window. Here are some photos to help identifying the replacement parts.I think I have the Series 600-21.It is of the 5/8 diameter. The top of the spiral balance is mounted with 1 phillip screw thru the top of the window and the bottom of the window has a somewhat long plastic sleeve whereby the bottom of the spiral balance attaches and slides with the window up & down.I'm not sure on the setup.Your assistance in this matter would be greatly appreciated in identifying the spiral balance and related parts for replacement.
A customer submitted photo of a spiral balance and pivot shoe.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. Based on the information provided, and the picture, I agree that you may need an S600-21 with a blue tip. Just double check to make sure that all the dimensions line up.

As for the pivot shoe, I'm afraid that I can't really identify it from this picture. Is there any way you can remove it and take a few pictures of it separately? Please see the video below for how to remove it. If you can't, can you take a clearer picture of the front of it and provide us with dimensions? We will need to know its thickness and width. Thank you.
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