get onto RealOEM and check out the part numbers for the wheels
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Hi Ken, I bought John Zeiler's K1300GT a few months ago. It will be a winter project for me to get it set up how I like it. I've already read about the offset. If the offset difference is like the early K1200LT's vs the later LT's I can fix that with spacers or machine the rotor pads down. What I can't fix is a different rotor bolt pattern.In theory, yes, all the front wheels are interchangeable.
Note that sometime in '07 they changed the way the front brake discs mount to the wheels. I've had two '07 K12GTs and if I swapped the front wheels, the axle would fit fine but brake disks would drag because they were offset about 1.5mm from each other.
Looking up the parts in an online BMW parts fiche is a good idea, but note that the rim itself may be the same dimensions but with a different part number because of paint colors.