belts
before the belts break, take them off from the car, measure the width, they should 3 mm or 4mm, then count how many tooth does it have. usualy the belts are S3M belts that means 3mm pitch. For my car the kawada, the rear belt is S3M 171 , the 171 denotes the length, when you divide 171 with 3(pitch) you will get 57 tooth..so lets say you count your rear belt 59 tooth, just multiply by 3 you will get the length, ususally you just have to mention the belt type (S3M) and either the number of tooth or the length, and then tell them what width you want. i recommend 3mm width becuase they are narrow and have less friction that 4mm width.