The Pontiac Montana 1988-1990 has 16,000 documented key codes in the range 00A0-99A9, 00B0-99B9, 00C0-99C9, 00D0-99D9, 00N0-99N9, 00P0-99P9, 00S0-99S9, 00U0-99U9, 0A00-9A99, 0B00-9B99, 0C00-9C99, 0D00-9D99, 0N00-9N99, 0P00-9P99, 0R00-9R99, 0T00-9T99. Uses a 6-cut single-sided profile. Set the duplicator to flat-bottom cuts 0.1″ wide. Code is typically stamped on the original key bow or available via the VIN through the dealer.