93 charade a/c tensioner pulley

Hi All,
Hoping you could point me in the right direction here.

On my g102 a/c tensioner pulley, apparently there is suppose to be a spacer behind the pulley, but mine is missing! This is causing it to rub on a metal bracket. Does any know what sort of spacer i need for this or where it is described in the workshop manual? Tried searching relevant words but cant get any hits. I was hoping that i could go to my local parts dealer and grab something close to original but if it was a special part, i was going to raid you pull it!
Any advice, help appreciated! Got everything else ready for my timing belt swap this monday! Yeieeweewe