While the Husqvarna Chainsaw Flywheel Assembly with Pawl is compatible with a range of Husqvarna models, including the 450E, 450, 445E, and 445, my experience with this product has been somewhat mixed. On the one hand, the assembly itself is well-made and seems durable, so I have no concerns about its longevity or performance. However, I did have some difficulty installing it, and I think the instructions could have been clearer. Overall, I would recommend this product if you have experience with chainsaws and are comfortable with installation, but those who are new to chainsaw maintenance or DIY repairs may want to proceed with caution.