I have two DCC equiped RS-27’s with factory sound. The speakers are round, about 1 1/4" in diameter, and mounted vertically in the shell just behind the cab, and there are two speakers in each unit.
I think thats the factory A frame speaker set up,mite be a bit difficult to duplicate ,even for someone very experience …Id get with Bruce @ lichfield station and see what he recommends . but Id guess the oval in the hood area would be a good start ,but thats a guess. yep ,Id ask Bruce…Jerry