I am trying to find a detailed diagram of the undercarriages of both a
 

1994 Honda Accord and a '94 Civic.? Obviously, I am comparing the differences in structural layout and the locations of parts (oil pan and filter, exhaust system, etc.) if that gives you any idea of what I would be looking for and you know a good site please let me know, and my thanks in advance. :-)

I don't know if they have these makes and models, but Auto Zone's web site has very detailed drawings on every car I have every looked up. Check them out!