Aiwa M800 cassette deck drive belt replacement?

The drive belts on my Aiwa M800 have melted away and left a sticky mess on the flywheel. I can cope with cleaning it all up but haven't got a clue what belts I need or how they run. The flywheel is a single one but machined to 2 different diameters, however there was no black marks on the largest diameter section, so maybe the deck only uses one long belt to both motors. This is a fabulous computer controlled deck and I'd hate to dump it, can anyone help?