The Modern Bajaj Chetak Rides On
You might also try Polyfil Nu Foam (1") batting. This is is a safe alternative to conventional foam that is made from densified polyester batting. It is mildew resistant, and won't yellow or disintegrate. Other motorcyclist have found it to make good air filter media when pre wetted with a spray on vegetable oil. I have not heard of anyone trying it in a Bajaj.