Bose 501 Series I, Series II Speaker Foam Surround Repair Kit - 10 Inch Fitsa Bose 501 Series I, and Series II and others that match the measurements Same surrounds that professional reconers use; not cheap Chinese imitations! Complete 2 speaker foam surround installation kit - 10 inch Easy to follow step-by-step installation instructions and videos FREE phone support at 1-800-397-9575 and FREE shipping within the U.S.