Trampa Street carver Battery Box

Need battery box (bottom mount) for a trampa Street carver deck. Options on the Market? Should fit 18650 12s or 10s4p and be flexible.

This one maybe?

https://www.kaly.nyc/product-page/battery-enclosure the 18650 version
https://www.eboardsperu.com/product/trampa-carver/
https://www.eboardsperu.com/product/trampa-carver-ds/