For over a month, two 5-button Autopage aftermarket alarm system remotes had been unavailable from the manufacturer. They are now available again and back in stock at Remotes Unlimited. See the links below.
One keyfob is RUI part 075-6066 (Autopage part number XT-33).
The second is RUI part 075-6106 (Autopage part number XT-65 or XT-65s).