Just wanted to add my 2 cents worth to this thread.
My Mum's Escort which was purchased from new by my Grandfather in 1975 was a Mk2 1.3L XL 4 door and it had the push button AM radio like in Eskie92's picture.
My Rally pack Mk2 2L 2 door 1978 had a Clarion? AM/FM tape player (with the Ford logo on the tape door) and 2 box speakers that mounted to the rear parcel shelf with wing nuts from inside the boot. The were rectangular with a 'woofer and a tweeter'. Very 70's. I don't have any pictures as it was in 1993. I gave the speakers to a mate of mine back then to put in his VE Valiant.
Cheers, Craig.