545XP 545XPMKII 550XP 550XPMKII. Designed to facilitate using Stihl pattern guide bars on the 8mm bar stud Husqvarna saws. Designed to be a slip-fit part on new case bar studs, but if your application powerhead has bent or galled studs or a worn bar landing area, you may need to fix your bar studs or press on the adapter with a little pressure or tapping action.D025 (Stihl) pattern bar oil slots / holes AND chain tensioner holes WILL need to be widened / modified to properly fit Husqvarna cases and provide chain lubrication.
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