reezekeys

Apologies if this has been answered already, I did try searching here. I need a second remote entry & transponder guts for my 2001 300GS. A few vendors have asked for the FCC ID# of my fob to insure it's compatible, but either it's worn off or was on the original key's housing which was replaced by a Stauber housing last year.

After some googling I see two different FCC IDs associated with my car: HYQ1512V and HYQ12BBT. Is there any way I can make sure of the correct part #? TIA. Below is a pic of my fob's guts.