They're called membrane keypads,universal ones are available from Digi-Key, Jameco, etc.I've never seen one specifically for auto applications, but the universal ones have legend sets(numbers and letters) that allow you to customize the keys.Downsides are, the outputs are usually multiplexed, and the switch contacts can only handle very low currents(less than 100 mA).So you'll need at least transistors and possibly a demultiplexer(depending on number of buttons).If you get a universal one, I can show you how to make it work if needed.
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