There are no "new" Ersons - they stopped making them several months ago. I purchased the last half dozen sets they had, and still keep some service parts on hand. There may be some in inventory somewhere - but I doubt it.
The new T&D street setup ostensibly replaced the Erson, and Erson is selling them as such. But they are considerably different in design. The T&D uses a horizontal bolt at the end to physically attach the end stand to the shaft, and has four independant stands similar to the original stuff. The now non-available Ersons had a consolidated two stand design that I really liked.
The Sharp parts are a very viable option as well - they've been making FE parts for a very long time. They are the only ones I am aware of that use a steel stand instead of aluminum - a pretty good idea.
Here are the T&Ds:
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Survival Motorsports
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Engine Masters Challenge Entries
91 octane - single 4bbl - mufflers
2008 - 429 cid FE HR - 675HP
2007 - 429 cid FE MR - 659HP
2006 - 434 cid FE MR - 678HP
2005 - 505 cid FE MR - 752HP