Colorado guy

Have two level 5 m3 12s in a extended cab Colorado will be on a DC 5 k ... deminsion for space are 18 1nchs high 48 inches in length and 22 inches for with .... I am going to build a box with a aero port .... how many cubes no I need for two subs .... what's a good size box for two level 5 12s

What is a good box size for sol numbers for 2 level 5 12s.... just trying to get a idea ....

I have a couple of level 5 12s .... I am looking for parts ... I can find the recones but can't find baskets online