This final rule adds: The one-year London Interbank Offered Rate (LIBOR) as an acceptable index for the HUD-insured one-, 3-, 5-, 7-, and 10-year Adjustable Rate Mortgage (ARM) products, and the one- month Constant Maturity Treasury (CMT), the one-month LIBOR, and the one-year (12-month) LIBOR as acceptable indices to adjust interest rates on the HUD-insured Home Equity Conversion Mortgage (HECM). Under current regulations, only the weekly average yield of U.S. Treasury securities, adjusted to a constant maturity of one year (commonly referred to as the one-year CMT), may be used to adjust interest rates on HUD-insured ARMs and HECMs. This final rule follows a June 19, 2006, proposed rule and includes HECMs in response to public comment on the June 19, 2006, proposed rule.