HI,
I've never seen a stock stainless steel exhaust system.
The steel ones are readily available and reports are that they are a fine exhaust but here in the USA they are all imported from Denmark apparently.
As near as I can figure one manufacturer has the world market sewn up! Afterall what kind of demand it there for an exhaust system that fits a car made in the 50's ??
Maybe over in the "old" country, you have some OEM stuff floating around??
With enough money, you can get anything you desire custom made.
Good Luck
Dave
"If you don't have the time to do it right the first time, when will you find the time to do it over again later?"