29 4 BSI channel balance for Kinco windows

A home owner from Charleston, sc says:
I just replaced the top sash guide, kinco 18-166 but would also like to get the channels guides. The stamp looks like 29 4 'and then printed in another direction BS1 14' not sure if this is BS / 14 or 85 / 14 have know clue.

The channel starts off like I said 29 4 'yes a space between the 9 and 4'
User submitted picture of channel balance attachments for BSI 29 4.
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Paul from SWISCO responded:
Thanks for posting! I'm glad to hear that our 18-166 worked for you. As for your channel balance, please take a look at our S385-30 with a 2940 stamp option. Do you think that might work for you? Please make sure to compare the dimensions of the plastic attachments on either end to your own hardware to confirm that they match up.
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