stripped

Does anyone know where I can get an oversized oil plug that will self thread, because I started to change the oil, and I was loose, and then we saw it had been stripped out and silicone had been used to keep in it. Its drained and everything but now I needa find a plug that will stay in. Can...

HELP!!!!!the place i brought my 2005 kfx400 stripped the threads on the bottom of my oil tank and i was wondering what size tap i should use i think a 10mm is good but i dont know??:mad::confused: any suggestions