Engine Oversize pulley for a remtec engine

Hi all I have a remtec engine that I have just rebuilt but I was unaware that the engine case opening where the crank pulley goes was also enlarged when it was line bored and that when I got it the engine cam with a crank pulley witch had an larger centre if that makes sense witch I bent when I was removing it :-(
I have fitted a stock one for now but there is oil leaking out from behind the pulley. So does anyone know where I can get a larger pulley from?