Spark plug

Hello everybody my name is Sam I’m a proud new owner of a 2006 first generation smart for two Mercedes-Benz engine I’m having difficulties finding stuff for it but I’ve been the only thing I’m having a very much difficult finding is the spark plugs themselves I know I need a new spark plugs on it because when I go up hill I feel there’s not that much power combustion’s whatever mechanic told me that I might need spark plugs so the question is what spark plug should I use for my 2006 Mark for to put uHello everybody my name is Sam I’m a proud new owner of a 2006 first generation smart for two Mercedes-Benz engine I’m having difficulties finding stuff for it but I’ve been the only thing I’m having a very much difficult finding is the spark plugs themselves I know I need a new spark plugs on it because when I go uphill I feel there’s not that much power combustion‘s whatever a mechanic told me that I might need spark plugs so the question is what spark plug should I use for my 2006 smart fortwo