I don't know if i am speaking in right track anyway the P&S [ Pass and Seymour ] do still making the device cover you been describing i am not sure if your electrical supply centre may have one on hand sometime they will find a way to get rid of very oddball items and not too many stock this around anymore but i know few guys on east coast use it alot so i will leave this post open until some east coaster get in here with correct info they can help ya with it
Merci , Marc
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)