Tags should denote seating capacity. I'm almost 100% certain that mine at home says Seats: 6
I remember this because I considered putting buckets in but a change in seating capacity requires a mod plate.
If you want to be 100% for sure, I can check my XB Sedan when I get home. It's a Falc 500, with bench seat. I'll double check the tag for you if you want?
He's a pic of a wagon tag. Seating capacity: 7