Regarding the belts Mickey posted the link to above....
I have not bought from these guys but my friend bought a set of belts from them for his Mk2 Sprite. He felt it was time to replace the old belts and wanted something similar. These belts are generic. The belts he got were NOT what he expected but the quality appeared acceptable, the look was OK, and the price was right.
If you want original looking parts, these aren't for you. If you want new, safer belts and don't want to spend $300, these generic belts are not a bad option.