Bang and Olufsen 4" Speaker Foam Surround Repair Kit - 2BP4Complete 2 speaker foam surround installation kit Some of the models that use this foam include : B & O, Bang & Olufsen 790208, 8480817, 8480248, 8480232, 8480143, (BEOLAB 6000 may need to cut seam down to fit cone), 6000C 75, C75, CX 100, CX100, CX 50, CX50 (6344), M75 (midrange), IWS 1894, R331Cx4, 1894 other models of Porsche and others that match the measurements shown Same American made surrounds that we use in our professional repair facility;