Ref. No. of serpentine belt and tensioners 94 RMW

Does anyone know definitly the GM Ref. No. of the following parts for  94 BRW:

- Serpentine belt ( for AC / waterpump / a.s.o.)
- Tensioner for serp belt
- belt for viscose fan > I reckon it´s special order?
- Is there a tensioner or an idler pulley for the fan belt what might wear out or get noisy ?

Any advices for some more (small) parts needed will be appreciated !