Looking for this part

A home owner from Los Angeles says:

Hello,

I am looking to purchase two of the above photo for my Crown brand window.

The only label is 20 4 HR CALDWELL.

Thank you for info in advance.

STEVE

Thumbnail of the uploaded file named Recent-New Measures.jpeg
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Tom from SWISCO responded:

Based on your photos, you have either our S390-21 or S351-21. The only difference between them is the size of the bottom fitting, which is indicated on their respective store pages. You'll need to measure your bottom fitting to confirm which one is the better match.

swisco.com
A home owner from Los Angeles says:
We have S351. I would like to replace both. (2)
What are the prices?
Will they come with instructions on how to
properly install?
Thank you
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Tom from SWISCO responded:

Detailed pricing for each product can be found on their respective store pages. They won't come with instructions, but the video below should help you if you aren't familiar with the process.

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