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With those jl's don't you need a lot of airspace? Your customs box might bring the subs all the way to the trunk. Or you can figure out someway and fire upwards. A box like that won't be easy to fabricate as it would have to be built in the trunk. You won't be able to take it in and out very easily either.
I don’t have a box i have to get a custom one i just dont know where to fit to 12’s and also how to get a custom box made
I recommend rolling up your sleeves and creating your own custom box; but that's just me. If not DIY, most any reputable custom installer will create custom boxes. Just pick one with some reputable recommendations. Its not rocket science building them but they need to be built right
The biggest issue is going to be finding a location and orientation that will accommodate the drivers diameter plus an additional 1-2" for the mounting ring. Once you figure that out, the rest of the enclosure is elementary