2001 Honda Civic timing belt tensioner

I am replacing the timing belt on a 2001 Honda Civic EX. I am putting in a new water pump and timing belt tensioner. The tensioner has a dowel hole in the back and so does the engine block. When I removed the old tensioner there was nothing to locate these holes. The new tensioner did not come with a dowel pin. I contacted Honda parts dept. and they said it’s not needed due to it doesn’t show a dowel on the schematics.
My question is …. do I need to dowel the tensioner to the engine block on a 2001 Honda Civic EX?