Hi I have a 2010 Mazda 3 Hatch, I am trying to order a replacement key from eBay. I am not sure of the FCC code as my one and only key is missing the keyless entry system, it's just the top half of the key. I have searched high and low for this info, Does anyone know the answer or can recommend the most common Hrz frequency? I've been told the cars use a Mitsubishi transmitter, what other brands are used? Does anyone have a workaround? Thanks