If you have a dune buggy or sand rail and you need to check to see what your front end requires use a 17mm and 19mm box end wrench. Put the wrench on each of the four nuts that hold the tie rod to the pitman arm and the tie rod to the spindle. If a 17mm wrench fits onto the nut, they are early model tie rod ends. If a 19mm wrench fits onto the nut, they are late model tie rod ends. It is important that you check all four tie rod ends because some vehicles have two early model and two late model ends.
Here is a picture showing how to measure a volkswagen tie rod end: