アーム B. ARM B [857B002]S B01 857-42000020 ｱｰﾑ ARM (STD 3.14m) B02 857-42100000 ｱｰﾑ ARM (LONG 4.14m) (OPTION) B03 857-42200000 ｱｰﾑ ARM (SHORT 2.46m) (OPTION) B04 857-42300010 ｱｰﾑ ARM (BMH) (OPTION) B05 857-42700000 ｱｰﾑ ARM (REINFORCED) (OPTION) B06 857-42900001 ｱｰﾑ( ﾎｷﾖｳ) ARM(WITH PLATE) (STIFFENER PLATE) (OPTION) [857B002]