If I wanted to shoot the rifle I would try reloading .45/70 brass and seating the bullet out further. I have read that you can shoot a .45/70 in a .45/90, and if it is loaded with black powder it would not be dangerous in any way. The longer .45 cartidges were express cartridges - would shoot lighter bullets for more velocity. I am pretty sure the .45/90 was loaded with 260g - 300 grain bullets and may have a twist for those weights. (not the heavy bullets in a .45/70.) I have a book on these old west cartridges round here somewhere.
Southernman is right - starline make brass for the .45/90 - Neil Hayes will probably have some call Hayes and Associates.
They put saddle rings on the carbines, not the rifles, or at least I have not seen a Winchester rifle with a saddle ring. But you could order the carbines either way.
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