Seta fitment question

I got a pair of racing buckets / custom mounts from a member here and they were in great condition.
I put the front right hand bolt in the drivers seat mount and marked the the left front bolt location. pulled the seat out of the way and drilled the hole.
And shazam I hit the existing hole on the reinforcing plate underneath.
I bolted the seat back in and sat down. WTF? it is not centered on the stock steering wheel. After measuring, the seat is 2" off towards the center of the car.
Is this the norm?
I will relocate the seat but I will have to cut the hump for the bench out and reinforce the new location.
Just wondering if I am alone in this situation.
Andrew