NHT 65 Speaker Foam Surround Repair Kit 65 Inch
Some of the models that use this foam include: NHT SuperOne, NHT 1A, NHT 1, NHT 2.1, 1-11-016-1, K43 TNC and others that match the measurements above.
This is for the older 80's-early 2000's models with the foam surrounds, NOT the newer butyl rubber surrounds.