You'll find references to Ford Racing M-6375-H46; I was told by Ford that those are discontinued, but did find a few in stock at, where's that place in the north-east that sells a lot of parts and online, too??? The name escapes me right now...twinrivers or something, in New Jersey or somewhere.
The V10 one (look in the forums) was the alternative I was going to use.
These are non-sfi approved, though.