Looking for speaker recommendations for '74 Sport's (Jerry) speaker brackets

Gentlemen,
Doug posted this thread at my suggestion. He bought one of my brackets I make for replacing the old single dash speaker with a pair of new 3.5" or 4" speakers. He was not sure which speakers to use, so I asked him (as I have done with everyone who buys my bracket) to post his questions on FABO and get a discussion started among the many of you who have already gone through the research and installation process using my brackets.

The point is not to choose his speakers for him, but rather to enlighten him and others facing the same dilemma with the information you can provide from firsthand experience with your installation. If you haven't used one of my brackets, then there probably isn't much you can tell him about the way your particular speakers fit, any conflicts or interferences you encountered because of speaker depth or center cone height, or the solutions you found to these issues.

The idea was to keep the topic specific to the use of my brackets. There have been enough FABO members who have used them over the past few years to give a decent range of options for other folks to consider when making their choice. So, let's hear from some of you guys.