I ended up with 15x20 open inside, closed outside drag chain. Here’s the link if interesting to someone.
https://www.amazon.com/LMioEtool-Plastic-Carrier-Length-Connectors/dp/B07QYM8XQ7/ref=pd_rhf_ee_s_rp_c_1_4/132-1450616-7539916?_encoding=UTF8&pd_rd_i=B07QYM8XQ7&pd_rd_r=42bc951c-ec44-4ccf-aa7f-a88bc7f76091&pd_rd_w=02udl&pd_rd_wg=NZ1KD&pf_rd_p=e7689c0c-effa-447b-90f6-431e8090e282&pf_rd_r=G062X596W7QRECG5PYR7&psc=1&refRID=G062X596W7QRECG5PYR7
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