I know it's not exactly what you're looking for, but Samplitude / Sequoia has a built-in "mutiband enhancer" that makes for a very effective elliptical filter (which is about all I really use it for). Yeah, they certainly getting to be rough to find...

Maybe some vinyl folk will jump in...

ADT currently makes a few different modules with EEQ's.

http://www.adt-audio.com/UsProducts/V700/V700ModMastBase.html

Also - you might want to email Mazz at http://www.vintagecity.de to see if he has any old Neumann EEQ modules in stock. He's the man as far as the older European stuff goes - I've always gotten excellent service from there.

And - you might also want to try contacting Al Grundy to see if he has any leads - http://www.cutterhead.com

Best regards,
Steve Berson

Elliptical EQ

The TC finalizer has got a multiband stereo enhancement insert i use it when the ee on my desk does not quite do the job.