My Jap radio was terrible, cd’s jump, radio band not compatable , to many flashing light, so I fitted an Alpine CDM 9803RR radio the display is red so matches the dash lights, and the fitter found a pocket to fill the gap. Recommend you fit the radio in the lower position on the Din2 opening and the pocket above as the angle is better to see the display. Steels’s can order a Pocket with has a hinged front P/n No 77280-S6M-A01ZA and you also need 4 screws p/n 93913-14280. Cost about £30. The gap is then OK for std radios. This is pocket is original Honda designed for DC5 as some markets had this dash set up
Fitting is easy now I know the trick to get the old jap unit out. First remove the small panel under the radio that has the power point, 2 small slots on the side, lever it forwards and it pops out. Then you will see 2 screws which hold the radio panel assembly, undo these and the whole panel comes out, do remember to reconnect the hazard warning light as the indicators don’t work.