VW BETA Radio

Hello

Currently i have a VW BETA radio but i want to buy a VW single CD player, but i'm seeing some with wiring looms, some with not.

some with trays and some with not.

what is the wiring loom for? i read somewhere the cd player just plugs into the back of the radio.

What is a radio tray?

wiring loom
http://cgi.ebay.co.uk/VW-CD-Changer-...3A1|240%3A1318

tray??
http://cgi.ebay.co.uk/VW-Single-CD-p...3A1|240%3A1318

cheers,
dan

The tray keeps the unit in place properly and the loom means that the buttons light up at night.