This American Range A99219 Top Door Hinge, according to the manufacturer, is neither left or right side specific. They simply have top and bottom hinges, and this hinge should work for either side of your fryer door.
Is your fryer an Imperial Range model? That's the only model IFS 40 fryer I could find. That said, we'll need just a little more information to find the part your looking for. Please give a member of our Tundra Restaurant Supply team a call at 1-888-388-6372, with your serial number on hand, and we'll help track down the appropriate hinge for you.