TPMS missing front 2 warning light on
 

OK im in Ohio just bought this 2008 sebring conv touring 18inch wheels. needed 2 tires in front got them but they wouldnt put on cause TPMS was missing in them( FRONT ONLY)( BY LAW THEY COULDNT PUT ON NEW:confused:) So my Q is i need 2 SENSORS ( Premium System) do i just buy 2 or is there a left right front back issue? frequency ive seen in the 300 range and 400 range and CONVERTABLE if that makes a differance? and which Brand would be best . (ITS MY WIFES CAR) so it must be fixed right lol.
thank you mfor your help . :)

TIrerack sells sensors that some have had good luck with.
(My wife also has a Stone White 08 Touring Hard Top Drop Top)

Ok ill check tomorrow ..i saw alot on rockauto lots of brands n prices ..just did know if there are specific frequencies ...and nice on the hard top..hers is blk cloth 2.7 l 40k im running Amsoil in it..