The denso spark plug for benelli 491 50 ac 2001-2006 is part of the latest collection from denso.Features: improved head dissipation standard u-groove low centre copper core heat resistant nickel jacket specifications: center electrode type: standard electrode tip material: nickel alloy product name: spark plug research value: finalized riding style: adventure touring dual-sport off-road street type: resistor type units: each to fit: aprilia area 51 50 1998 european models aprilia area 51 50 1999 european models aprilia area 51 50 2000 european models aprilia area 51 50 2001 european models aprilia area 51 50 2002 european models aprilia gulliver 50 lc 1996 european models aprilia gulliver 50 lc 1997 european models aprilia gulliver 50 lc 1998 european models aprilia gulliver 50 lc 1999 european models aprilia rall modelsy 50 ac 1993 european models aprilia rall modelsy 50 ac 1994 european models aprilia rall modelsy 50 ac 1995 european models aprilia rall modelsy 50 ac 1996 european models aprilia rall modelsy 50 ac 1997 european models aprilia rall modelsy 50 ac 1998 european models aprilia rall modelsy 50 ac 1999 european models aprilia rall modelsy 50 lc 1996 european models aprilia rall modelsy 50 lc 1997 european models aprilia rall modelsy 50 lc 1998 european models aprilia sonic 50 ac 1998 european models aprilia sonic 50 ac 1999 european models aprilia sonic 50 ac 2000 european models aprilia sonic 50 ac 2001 european models aprilia sonic 50 lc 1998 european mode...