Clifford - I managed to get to my storage, and took photos of my manifolds. The clearest number was B67207
I googled
"B67207" "FE" engine exhaust, and found this thread discussing the part
http://www.network54.com/Forum/74182/thread/1191946603/1192167381/Identifying+stock+exhaust+manifolds+-+possible+upgrade Interestingly, this thread was started by a fellow in the UK, and his car was a UK-built custom. So... Is it possible the non-standard casting number might be due to it's being a UK manufactured part? Seems unlikely, but not entirely impossible.
The moderator of the thread was/is Bob Sprowl, and the link to his FordFE site is above, in my previous contribution. He might know...
It certainly seems to be the opinion of the participants in this 2006 FE thread that the manifold is FAR, FAR Faaarrrrr.... from being a "performance" part.
Sorry to be of little help. I vaguely recall Mike McClusky saying he thought these were used in "Country Squire" Estate wagons. I think that may have been a bit of dry humor on his part. Some were used on "original" Cobras - the 428's - that were subsequently re-engined by Shelby or modified by early owners. They are (apparently) one of several variations of "standard FE" 8 bolt, center dump items.
I'll ask around. It's a slim possibility there might be a pile of them in a corner somewhere. Good to know for the ACOC Frua parts list.
Dorman have a 'made in China" replacement that
might work, sold by Summit racing. Otherwise, it's Ebay, junkyards or (best case, already discussed) modified "shorty" tubular headers.