I just pulled my stock radio, as part of a center console bezel replacement.

Went with the Wal-Mart key-kit, $5 and change. Was on one of the pegs, with all radio connectors, etc., near the car radios and speakers in WM, in a small clamshell. At my store it was hidden by an improperly hung item, so short term panic 'till I found it.

The two keys are inserted with the curved-parts of the end toward the center, and the flat sides out. They are pushed in, past the resistances, until the finger rings almost touch the face plate. Then the radio pulled out easily. Two connectors, and you're done.

Releasing the keys requires pushing hard with a thumb on the little metal spring/levers, on each side of the radio, inward toward the tips of the keys.