Channel balance questions

A quick learner from Ft Myers, Fl says:
I need new channel balances for a DIY project. I have two different sizes:
23" shaft length with 22E stamped
29" shaft length with 28 D stamped.

Both have the same top & bottom pieces as shown in the attached pictures.
I need to order 6 of each, and want to verify that I am ordering the correct replacements.
Thanks,
Mike
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Tom from SWISCO responded:

Thanks for posting! I recommend our Series 380 for both balances, assuming the nylon attachments are the same between the 23" and 29". 

For the 22E stamp, I recommend our 2250 option, and for the 28D stamp, I recommend the 2840 option. You may want to weigh your sash on a scale to confirm these options are correct. You can refer to the chart shown on both the S380-23 and S380-29 store pages.

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