I’m looking for a vintage Champion spark plug. Specifically: Champion – 2, Harley-Davidson.?

It came off a 8hp Cushman cast iron motor.

eBay is where i would look
Antique Stevens US and Spain Cast Iron Mechanical Bank

WALL CROSS RUSTIC CAST IRON VINTAGE STYLE ORNATE NEW

$7.99

WALL CROSS RUSTIC CAST IRON Vintage Style DESIGN ORNATE

$5.99

WALL CROSS RUSTIC CAST [...]