Cargo tub sub enclosure?

[cmykpro]

I have a slim mount 10" sub I'd like to place in the cargo tub. One would think there would be at least a few options for drop in enclosures but I'm not having any luck finding any. The JL drop in stuff is out of my league, just looking for an empty enclosure. Do they exist?
Picture of supposed factory 23 enclosure option for reference....

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