Ok just got a 2003 sable LS. Couple of thing I would like to know the dealer I got it from didn't know. One, how do I tell if the car is compatable with a key fob. it didn't come with on. Also the stero has a cassette but it has a button for CD. And one for disc select 1 - 7, Does any one know what that is for. Also where do I get the numbers or how do I reset it , for the keyless entry codes. The key pad under the drivers door handle.. Thanks for the help