wrote:
Rear seats in my 72 Arrow remove in seconds. As I recall, there are
four slots in the floor that accomodate four mating prongs on the seat
base. Again, if I recall correctly, push FORWARD on the whole seat
while lifting up. The 72 Arrow has two individual rear seats so may not
be the same but give it a try. No effect on the structure but might
want to consider weight and balance.

In fact, it might be prudent to update the weight and balance section of the POH
with seats-in and seats-out weight calculations, unless your POH has some
other provision for flying without the seats.