Picture 1: Had two belts, GM and Powertorque. You can take a Chevy truck '90-'93 belt, any model (thanks Chris!) The GM belt is 2470 mm in size. Some people have found a 2460 mm belt (forgot the brand), seems that this size is better but I have no problem with the 2470 mm belt.
Picture 2: GM belt number
Picture 3: The grooves of the Powertorque belt are narrower than my original belt but I heard that it works. The grooves will are pre-forms. Picture 4: The GM belt have wider grooves or channels, so I took this one.
Picture 5: Make sure to support your car.
Picture #5a: You can always do it without removing the wheel. Just turn it at max,but I find it easier with the wheel off for the first time
Picture 6: Remove the splash gard (3 screws)