Dottie, I had a response that included included a web link in it, and that's pending release now by a moderator, but here's what I wrote. This should be published immediately, if I understand the site correctly.
I'm certainly no expert (note that I'm new on the forum) but it seems to me you need to first determine the definition of "replacement" per your policy. If it's the same product in the same condition, you'll want to search on used versions for sale now - I see a pair on Ebay - and I'd argue they also need new panels so the condition is known. ML can tell you the price for a pair of panels.
If "replacement" means equivalent, new product from the manufacturer, you could likely argue the 9a, 11a or 13a are close to equivalent. They actually provide amplified power for the woofer, but their electrostatic panel sections aren't as tall as those in the Sequel IIs.
The Sequel II info is in the Martin Logan "Product Museum" available through their site. From the MartinLogan dot com site, click on Support then Product museum. (Edited to remove direct link so this isn’t held any longer for moderator approval.)
If you contact Martin Logan, they can probably tell you the area of the electrostatic panel on a Sequel II, and which speaker in the current line is closest to that. It may help your case with the insurer.