I am having a hard time telling from the photo. For WW folks they want a very aggressive inset, but for sea kayaks you usually go less so. You want to be tucked in there some, but with a less aggressive hook at the top.
If you can find just a square 4" by 4" block of decent thickness, that often fits more easily in a sea kayak than the ones for WW boats. The WW boat pads tend to assume they'll be glued to the hull of the boat, but for sea kayaks you are usually gluing them to the side of the seat itself. (That is, until you decide you hate the seat and take the whole thing out to replace with a foam seat from places like Redfish.)
Kayak Deck Gear Bags
Full Size Sail Rig
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