Dan,
It was a long time ago but that particular panel was on my 1996 H376 and it too failed. It was a flexible type and made in Mexico by a company which was bought out by a rival. The new owners 'rationalized' the range and dropped this size!
The following is from my boat's file:-
Original UNI-SOLAR MBC-262 690mm x 290mm.
Replacement SOLARA 160M 740mm x 450mm. 45 Watts peak or 180 WH/day – see Barden's website.
However the new panel is rigid on a 1/8" stainless backing panel. It is also larger. I found it necessary to remove the picture frame moulding from the deck and infill it with a piece of marine ply about 3/4" thick and well coated in epoxy. The new panel was then screwed over the infill and covers it completely.
However much water has flowed under the bridge so I suggest checking with Solara to see if they have reintroduced the original size of panel.