I need help Building an enclosure

I have an 2003 envoy xl so space isn't am issue I want to build a port enclosure for two American Bass XFL-1244 2019 I have already built one it hits lower note but not so much high ones. These are Dimensions

Box External Dimensions

37.00" × 17.00" × 23.81" 5.2 ft³ 33hz port 5.40" × 15.50"Port Length28.66 help please 

So what exactly v are you needing you have dimensions. Is that the box you have now?