Spiral balance tubes for vinyl windows. OEM MW windows

A handy person from Lincoln University, PA says:
Tubes are 3/8" diameter, 31" long.
Widow weighs 17.5 LBS
Windows are original to house and installed in 1999
What color replacement bearing should be ordered?
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Paul from SWISCO responded:

Based on the information and photos you submitted, I feel our S900-31 spiral balance with a red tip could work for you. The red tip can hold a sash weight of 10-22 pounds. Look it over and let us know if you think we have found your match. 

A handy person from Lincoln University, PA says:
Received the red tip tubes today. Thank you.
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Paul from SWISCO responded:

Great, I'm glad to hear it! Please let us know how they work out or if you had any questions. Thanks again for ordering with us.

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