Hi,I have a stihl 2006 fs55 in for repair . Someone in the past has replaced the carb with a non genuine one . Sadly I can't make out the serial number. Can you advise on a carb please.

These are the carburettors available for your machine. 4140 120 0610 - https://www.lsengineers.co.uk/catalog/product/view/id/17687 355 1501 - https://www.lsengineers.co.uk/carburettor-for-stihl-fs38-fs55-brushcutters-replaces-4226-120-0600.html