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The remote you need is from the alhambra 2001 onwards model (the 7M3959753 number is the SEAT part number)
As for the remote the programming of that is easy
key in the ignition and turn so the dash lights come on,
leave it there for a couple of secs and then remove it
hold the lock button down and whilst holding that press the unlock button 3 times
release both buttons and the remote light should flash 5 times but it should also lock and unlock the vehicle programming the remote to the car (This might not work 1st time but does once you get the knack of it)
D O N E !!!!!!!!!!!!!!!!!!!!!!