The original Polk SL1000 tweeter had an aluminum faceplate. That tweeter is no longer available. Instead Polk offers a black faceplate tweeter. They used the faceplate from the SL2500 and the dome from the SL2000 to make a replacement tweeter that is suggested for both the SL1000 and SL2000 models. The new faceplate does not always match up perfectly to the original faceplate, so you might need to adjust your screw holes accordingly. Polk has issued this statement Polk SL2000 size explanantion. Although the SL2500 and the SL1000/2000 tweeter look very much alike, there are differences in the voice coil which affect the frequency response so use the model appropriate for your speaker.
Cathy grew up in NY, moved to Florida in 1975 and graduated from the University of South Florida, with a degree in broadcasting. She and her husband Glenn started The Speaker Exchange in 1977. (Glenn later moved into Audio/Video sales and installations). In 1979, Cathy went to California for JBL speaker repair training and later received advanced training from Frank Spain, the then head of the Electro-Voice service department. She has continued to advance her audio education through many CES, NAMM, and CEDIA trade show classes.