Where do I find, and how do I replace the belt in an Aiwa DX-C100M2?

i have an old aiwa dx-c100m2. the belt seemed stretched out a bit too much, not enough power to trip tiny switches that trip the cd player to load/unload and play. i tried to get the belt out, after removing the housing but it's stuck. anyone know where to find a replacement belt, and how to remove/replace with the new one? thank you!!

Sheila
July 2013