M.hony, I assume you are referring to the back and not the back cushion.
We redid both dinette's back upolstry in ours. The buttons on the back side of our 93' Excella are actually a special nail that was upolstered and help hold the back panel on to the dinette. They are nailed into wood runners running horizontally. Of course we had to disassembe the whole dinette to get the backs off.
We replaced our "buttons" with some fancy upholstery tacks. Served the same function. But they were coordinated with the cabinet handles in our 93'er.