You could try the New York military Museum here's the link. http://www.dmna.state.ny.us/historic/mil-hist.htm They may be able to help. If you come across the term Dress coats, it's a frock. As to how many rivets Their bayonet scabbards had, you may never know, as I doubt they were interested in such minutae.
Co A, 2nd Battalion Ga Sharpshooters/64th Illinois Vol Infantry "Yates' Sharpshooters"
Savannah Republican Blues
Co C, 3rd US Infantry
Ships of the Sea Maritime Museum & William Scarbrough House, Savannah, GA
"I hope to live long enough to see my surviving comrades march side by side with the Union veterans along Pennsylvania Avenue, and then I will die happy." - James Longstreet at a Memorial Day Parade in 1902.