Aft isinglass panels tough to zipper to arch on both port and starboard side.
The EZ-Xtend zipper is a single unit, sold one at a time. They have teeth on opposing sides. So if you need both port and starboard you would need to order two units.
On the other hand the EZ-Xtend Align-a-zips are sold in pairs. The tops of these zippers are offset from each other and it would be difficult for the boat owners to tell me which one they actually needed.
Thanks for the question.
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