I discovered that Fitz-All makes a percolator top that fits the Revere Ware percolators with the glass knob. Look for model #246 (also called large size) that claims to fit 1 1/2 inch to 2 1/2 inch holes. Known to be available at Amazon.com or search Google. We also sell them in our store.
Fitz-All also makes generic pot handles (model # 782) that fit the newer (post 1968) Revere Ware pots quite well, although they will look a little different than the originals. Although we sell a replacement handle for the single screw variety, these handles are incredibly cheap if you don’t care whether they look exactly the same or not.