The disc tray loading belt - this part should be available from Panasonic directly; just quote your DVD recorder's model number, and order the belt if you can fit it yourself. Shouldn't cost too much for a loading belt, and, as I said, if you can fit it yourself, you save on expensive workshop repair costs.
In USA, you can contact Panasonic support by phone:
Product Support and
quote your model number, and ask about a tray loading belt for your (or similar) model. Forget their parts and accessories site - it offers zero help. There may be a generic belt kit (including a similar sized belt for your tray) to suit your model from places such as Radio Shack which could be closer to home.
Just one idea, or you can have a look at this:http://www.kenselectronics.com/lists/belts.htm
I don't know how much use that will be to you, but worth a look. (you may need to remove your old belt and measure its circumference for an approximate generic replacement size)