My ac compressor is shreding bits of metal.I think the bearings in the pulley is bad. Can i bypass it by buying a smaller belt and bypassing the ac pulley?
Yes you can, and this is definitely possible on some models of car (I know for sure that that can be done on my car and it is a belt from a Renault - can't remember which model).
You need to find the length of belt necessary, so take a piece of string and wrap it around all the pulleys, make sure the adjuster or tensioner pulley is in the compressed position and you will have the minimum length of belt required.
After that all you need to do is find a matching belt - some places are very helpful, others less so...