I don't think New Elms has a web site - though you will find a link from Tim's car search company.
Leiter Motor Company are the people commissioned to make the undertray.
A search on eBay for "Morgan Undertray 4/4, Plus 4,+ 8" should bring up the item in question.

Follow this thread:
http://www.talkmorgan.com/ubbthreads.php..._tray#Post53598

Cheers,

Graham (G4FUJ)

Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW