This excerpt taken from the SIRI 10-K filed Mar 1, 2007.
Other Terms and Conditions. Subject to the terms of the Plan and any applicable Award Agreement, the Committee shall determine, at the grant of a Stock Appreciation Right, the term, methods of exercise, methods and form of settlement, and any other terms and conditions of any Stock Appreciation Right. The Committee may impose such conditions or restrictions on the exercise of any Stock Appreciation Right as it shall deem appropriate.
Section 8. Restricted Stock and Restricted Stock Units.