For diagnostic purposes switch the tires side to side in the front. If the car goes to the left you have found the problem (one or both of the front tires.
Rotating front to rear, probably will solve the problem, but I have seen many cars that aquire the same basic problems on the rear and bt doing the switch you are left still in the dark if you still have the pull. Going side to side leaves tires from the equation.
Nine of ten cars brought to me for alignment due to a pulling condition are due to the tires. Half of the tire problems come from alignment and or the remaining problem of POS tires.
Bosch Master, ASE Master, L1
33 years MB technician