Yep, That was the first thing I tried was buying replacements from Chief Buildings. The company is still local and in business but they don't press out that type anymore. I had this building put up in 1965 and they no longer make that ridge or corrugations to match any more. Back then for a 40X72' was $7500 with concrete Now, just for laying ontop a new white tin roof...$10,000.
Before paying that I am going to brush something on the sky lights. Can't be as hard as building a airplane.
Thanks
Jim