where did you get that radio/heater delete panel? I just ordered one that said it had both delete panels in one, it came with the radio slots but the heater panel was solid.
you need a heater delete AND radio “delete” fascia/plate.
you can make with with textured plastic sheet to cover the heater controls. Then glue plastic plug for the radio holes and the modeling putty to smooth things out. Also sand off the outward ledges around the radio cutouts.