Carnet shall be obtained from country of residence & applied before start of journey for countries of transit. entry & exit border points with tentative dates. The documents required are: Vehicle registration book, including color of shell, interior color, engine & chassis number, valid local driving licence & international drving licence, plus a blanket insurance from an insurance company covering all countries of transit.
You can ask Punjab Tourism Dept as their buses shuttling to India have Carnet de' Passage.