Dell L501X queries

I've bought an L501X and since I have already upgraded to a 1080 screen from the original 720 screen. It has an i7 Q740 and 8GB RAM. I'd like to know the following if anyone can tell me:

1. Is there a backlit keyboard available for this? Must be a UK model (I know there is a US keyboard avaialble) and the L502X keyboard has a smaller ribbon keyboard and won't fit properly either. Is the US layout the only one that will work?
2. What is the fastest i7 CPU the laptop will take? I have tried an 840QM CPU and the laptop didn't boot and nothing on screen. Not sure why. Socket G1 CPU.
3. Does anyone know what the part number for the TV Tuner antenna is (the wire from the Avermedia card to the socket at the back)? Again UK spec.
4. Does it have to be an Avermedia card for the tv tuner?

Thanks.

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Dell L501X queries