Largelunchbox

Hello, I have just purchased a 85 riv in the uk, one of the rear speakers has blown and I’ve removed both for upgrade, both front door speakers seem ok so ill leave them for now, my question is is there supposed to be speakers in the rear quarters? There is grill trim like on the front doors but I’ve no sound from either. Also how do I remove the rear trim to check? Many thank from uk ( big us car fan)