Amazon.com: 2pcs 6 inch / 156mm Perforated Rubber Speaker Foam Edge Surround Rings Replacement Parts for Speaker Repair or DIY (Black) : Electronics
2 Pcs 6.5" Replacement Speaker Foam Surrounds For NHT Model 1.1 Woofer Repair | eBay
Should I replace speaker foam? : r/vintageaudio
Amazon.com: Springfield Speaker 6.5" Foam Surround Repair Kit - 2 Speaker Kit - Compatible with Several Dozen Commonly Used 6.5" Speakers of Different Brands and Models Whose Foams Match The Measurements : Electronics
How to Repair Your Speaker - Replace the Foam Surround (Refoaming). - do-it-up.com
Speaker Foam Repair & Replacement from Start to Finish - YouTube
4.5" 4.5inch Speaker Foam Edge Surround Rings Replacement for Speaker Repair or DIY - Walmart.com