To disconnect the wire that goes to the seat back recliner switch you slide this little cover off, then slide the connector out.
Here is the passenger seat finished...
... and the 2 seats installed.
The difference in colour between the original "savana" and the "lark" inserts is noticeable but doesn't clash too much because they are not side by side.
I am happy! I'm curious as to how they will look after being used a bit.