Dont think any models came without a stereo other than the Polo and base Golf but I am prepared to be proven otherwise.
The cars always had a base radio/cassette with the option of upgrades if you paid a few pennies more – often tended to be that the posher the car the more likely of an upgrade. I would have said, perhaps Blaupunkt Cambridge....
........ but any model of the age would not be out of place