Interior Doorknobs, Doors & Baseboards

I'm looking for interior doorknobs & doors that either are originals or look like the originals. The problem is that ours were changed to country style before we bought the house, so I don't really know what the originals looked like... Does anyone know where to get doorknobs or doors that look like the originals? Or does anyone have pictures of what the originals looked like?

Also, any chance anyone out there has original mahogany baseboards they'd be willing to sell me?

I'm remodeling the bathrooms and am slowly trying to transform the house back into it's original modern style.

Many thanks in advance,
Susan