[utility][product metafield][variant keys]oem-front

◇ Shift(3, R1): 1.75U, 2.25U, 2.75U
◇ Control/Alt(3 each, R1): 1U, 1.25U(2)
◇ Win/Fn(2 each, R1): 1U, 1.25U
◇ Space(1, R1): 6.25U
◇ PgUp(3): 1U(R2, R3, R4)
◇ PgDn(4): 1U(R1, R2, R3, R4)