This is Unbelievable.
I have Classic CBZ 2001 model & I got the Chain sprocket in a jiffy in Bangalore no need of waiting etc.. Hero Honda has good reputation of providing spare parts for a long time even after the bike is discontinued & a good answer is HH CBZ Classic, Ambition etc.
Although in some cases you would need to wait for a max of a week to 10 days when the spare is unavailable at your local city & had to be ordered to get from their Gurgoan plant.