I don't know the model number but have a LR part no. the CD changer under the seat is Philips DC-012 that also has a LR part no.
Both items are obsolete now, below is what a ES Philips head unit looks like this one went for £76 + £10 p&p on eBay
I just about to pull the kit out of my disco as my head unit does not see the CD player now, all I get is "no CD" i'm going to fit a Pioneer head unit which i've had for a few years with it's CD changer under the seat every thing will work except the dash/steering controls