Im so sad my Sennheiser headphones from ~2001 are slowly deteriorating, and the parts are no longer available! There is an updated version that they still sell

Im so sad my Sennheiser headphones from ~2001 are slowly deteriorating, and the parts are no longer available! There is an updated version that they still sell the parts for, but the specific ones I need are different. Still I believe Sennheiser is really good compared to an industry average in providing spare parts.