Does anyone know if it is possible to get uprated pulleys for a Calibra Turbo and if so where from?

I had the jockey pulley on my Calibra Turbo shatter and as the con rods were bent it was new engine time. I also noted that the crank shaft pulley was on its way out (after the new engine was in) so that has been replaced too.

Has anyone else had experience of pulleys going? I'm hoping to mod the car further to 300bhp+ so I assume this will be required?