Acura TSX vehicles used keyless entry remotes with FCC ID OUCG8D-387H-A from 2004 through 2008. For 2004 and 2005, the vehicles used a single 4-button key fob. Then, for 2006, 2007 and 2008, the Acura TSX offered a seat memory option, so two more remotes were added to the mix. The remotes for vehicles with seat memory have Fob 1 or Fob 2 on the back of the case. However, it does not matter which of these three key fobs you buy as a replacement for your car remote because all of the remotes are interchangeable. The only difference is the case markings that are there to help you tell one key fob from another so you get the correct seat and mirror positioning when you press a button on the remote.
Note that all three parts are user programmable. Instructions and phone tech support are included with your purchase.