To be absolutely certain, you should:
* Consult a repair manual: A Haynes or Chilton manual specific to your 1996 Ford Ranger 4-cylinder will have a diagram showing the exact location.
* Use a parts diagram: Online parts suppliers (like AutoZone, Advance Auto Parts, etc.) often have detailed diagrams you can search using your vehicle's year, make, model, and engine.
Looking at a parts diagram or a repair manual is the most reliable way to find it. Don't solely rely on general descriptions.