What we read on the department's FAQ page. Stamp papers up to ₹10,000 can be bought from stamp vendors; for larger amounts the executant obtains them from the treasury after depositing the amount in the State Bank of India under head "0030-Stamp and Registration". For current duty, fee and charge amounts, the page directs readers to the HARIS counter at the Sub-Registrar or Joint Sub-Registrar's office where the property is located.
Model formats are a starting point only; your advocate should adapt any deed to the transaction.