Need window parts

A quick learner from 95135 says:
Hi there:

Not sure which part I need.

These are pictures - the most telling is the stamping '2130bd' - the 21 is likely 21" tall. The '30bd' looks like an 'option' but I don't see any 'options of '30' for 21 - only 20?

Could you please tell me which part I need?

Thanks,

Eddie
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Tom from SWISCO responded:

No, that 21 does not reflect the length. Choose S350-22 with a 2130 option like what is printed on your balance.

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