I don't know precisely which pot it is, but to answer:
It's probably 1k 60 degrees. i would also presume it's linear, but not sure about the marking there.
Whether you can use a 5k or 10k pot might depend on the calibration options within the game service menu. If there is a complete recalibration that starts from zero, with the pot and the wheel centered, then you would simply calibrate as far as the wheel turns in each direction.
That said, matching the original might be easiest.