There's two drain plugs on the 525. If it's the plug itself you can get them here.Items #6 and 23.Dirt Cheap Yamaha, Polaris, Suzuki & Kawasaki OEM Parts & Accessories – Cycle Parts Warehouse If the drain plug is ok(which ever one) and it's the case threads,take the plug to any good hardware store and they should be able to measure the size and pitch of the plug. Helicoils are ok,but a time-sert if you're able to use one in this area is a better repair.In many cases cheaper to let a good machine shop repair rather than buying an expensive kit. Big-Sert Oversized Kits

 

And easier, too