Which channel balance to buy?

A handy person from Murrieta, CA says:
Hi...just wondering which channel balance option would be best? I'm trying to replace units that are 27" long x 5/8" wide. The stamp says 2630. Looks like it also has a stamp that says "3.S.I" and "RJ". Please see attached photos of the plastic ends. Thanks!
User submitted image of their window hardware.
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Tom from SWISCO responded:
Hello! We can help replace this for sure, but it will have to be a custom made balance. Before we begin, can you just tell me how many you need?
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