got a stihl ms880 coming tomorrow hopefully with the 48" bar and chain which is .404 and i and the dealer are struggling to find ripping chains for it as both stihl and oregen only sell that chain in full rolls for about £300 or something. so im hopefully going to sell the bar and chain on ebay and get a new bar and chain in 3\8. can somebody point me towards what i need to change on the saw? drive sprocket? clutch cover?