I thought I'd update this thread in case others ever need to know...
I originally thought the hatches were made by
Goiot but I was reliably informed that
Fountaine Pajot fitted Goiot
portlights to the
Bahia and Lewmar hatches. Back on the
boat it clearly says 'Lewmar' on the hatches. Oops! The two large bridgedeck hatches (not escape hatches) on my Bahia are Lewmar Coastline SZ40. The official lewmar replacement seal was the same
price as the seal sourced by the local chandlers in
Spain, except the seal from the chandlers was long enough to do two hatches. Sorted!