After much research and several months of having no door woofers, I decided to repair the speakers.
It cost about $53.00, and about three hours of my time. They sound perfect, and I am very glad that I chose this solution.
I contacted a company called Simply Speakers. They sell repair kits for all types of speakers. They were very familiar
with the foam edging issue that afflicts the door woofers of the Mark Levinson system. The website is: Simply Speakers
I ordered a "New-Edge-It"® Replacement Foam Surround Kit" for a 6 x 9 speaker and specified that it was for the ML SC430 door woofe