My old blades are 14" long
So I bought one new arm Anco 4102 and 4 new blades Anco 3114 from Rock Auto for $30 total with shipping.
From that first link, replacement Vespa exhaust springs are 60 mm long.
So here are a pair of 60 mm springs stainless steel that I may buy for $7.95
https://www.amazon.com/Outlaw-Racing...exhaust+spring
Or 57 mm which might be too tight.
https://www.amazon.com/gp/product/B0...1EZGPQ6VJCAKPT