Measure your original foam so you will know which Refoam Kit is right for you. It is important to measure the FOAM only and not the frame or cone. Measure the inside and outside diameter of the original foam. Even if the foam has completely disintegrated, you should still be able to see a line where the adhesives were or where the foam once was.
Imagine your speaker is a clock. You can find the OD (outside diameter of the foam) by measuring from the outside edge of the original foam at 9:00 all the way across the center of the speaker to the other outside edge of the foam at 3:00.
Do not measure the cone. If there is a gasket, remove it so you can measure the foam edge under it. When evaluating, remember, the inside edge of the foam will overlap the outside edge of the cone by approximately 1/4" (0.250).
Definitely go to the Measuring Your Foam under the Refoaming Info Tab. We have more pictures and info listed there and a detailed explanation about FOAM vs ROLL measurements.