My Husqvarna 40/45 purchased in '91 needed the chain brake. The part description ordered said would fit a model 41 (91-94). I thought it would fit. The stud holes in the chain brake were about 1/4 of the diameter of the studs to narrow. Could not find a specific chain brake for my saw. Parts schematic said the brake was no longer available. Otherwise the nut ordered were good and the ordering process and customer service were very good.