weldmart.com pretty much all parts. aeiokla.com for magnetos. parossmachinery.com for continental engine parts are a couple of places. a few guys here on this site plus stumpf 618.566.4733. hybriweld 985.384.6914
Kaye at bills welder repair.com has what ever you need and if she dont she can get it they are very reasonable on prices and help you solve your problems as best they can