Oh wait. Of course Matthew is Scripture and he quotes that the Messiah will be a Nazarene. Where is THAT found in the Old Testament prophets? It isn't. And neither is the interpretation given by Matthew for the other verse I quoted (Matthew 23: 1-3) found in the Old Testament.
Please go here: http://socrates58.blogspot.com/2006/07/books-by-dave-armstrong-catholic_31.html
You say that we Catholics use "extra-biblical" material. It turns out that Oral Tradition was well established and appeared in the Gospel of Matthew and in other locations. You must rely on Tradition or you cannot explain Scripture.
Wrap your head up with some duct tape for your own sake. Sola Scriptura does not exclude tradition as an invalid explanation for Scriptural Interpretation.