The difference of A and B refer to the pictures.

Suggest solutions：
5 Seats Car：
2 pieces →→→ Front-A-1set （ Or Front-B-1 set）
1 piece →→→ Backrow-1 set

7 Seat Car：
2 pieces →→→ Front-A-1set （ Or Front-B-1 set）
2 piece →→→ Backrow-1 set

Item : Car Seat Cover（Universal size, fits 95% Car seats）

Size: (check the size table picture first)

Front - A- 1 set :
One piece of cover for Back cushion & seat cushion on the front seat



Front - B- 1 set:
One piece of cover for Back cushion & seat cushion on the front seat


Backrow-1 set
One piece of back cushion & seat cushion on the 2nd row or the 3rd row(If you have)