Hello guys, I the am in USA with my family for vacation, I went to three shops selling Stihl items and wanted to buy a carburetor for the MS 660 chainsaw and the salesman asks me I should have the model number of the carb I told him I do not have here in this country. He told me there are three types. This is the first time I know that there are three carb. Dose anybody know the type of carb or the model number that came with the MS660 chain