I think I found the correct rated speaker at Radio Shack years ago. They were the only place that had "lo-fi" stuff for low wattage radios. Seems like the wiper levers slightly hit the magnet, so i shaved a little off the magnet for clearance. Had it in my '64 with a stock radio for about 10 years and it still works. My volume does drop sometimes and I have to wiggle the knob, but it has nothing to do with the speaker. Probably needs a good cleaning.