Batu Han

So I did a quick road trip after the repairs and my tensioner pulley just snapped as I was pulling in to park road side for a good weekend.

I'm trying to figure out what the best thing to do is in this situation. I called Mercedes and they sell pulley with tensioner as one piece but there is a bolt to take off pulley only. Does anyone know if its possible to replace the pulley only? or if its a must to replace the unit together. The problem is the part from mb won't come in for a few days and I'm 200kms away. I'm trying to see if I can get a pulley here as it would be a half hours work roadside.

its the m137 engine on the s600