Which bench? '81 was with out armreast, with armrest optional. '82 up with armrest was standard. The Dark Maple was '81, '83, '84. The '82 used a simular but slightly darker Redwood. All years used code 77 & almost the same patterns. I know this cause my '81 has the non armrest bench in that color. Malibu's & El Caminos will have the same seat color/material for those years (Malibu for '81 as last year for coupes.) Possible the BOP cars could have the same material to match in base models.