Just replaced both TAs recently. Following the instructions on this thread, and the videos on youtube made the project a cinch. Replaced the Fuel Breather valve also (symptoms were rough idle intermediately after refuel).
Got my TAs from
http://www.rebuild.org.uk/ . Amazing customer service, and lightning fast delivery from the UK. I placed my order Thursday morning EST, and received it the next day. They offer a core exchange service which is very convenient, or you can send in your TAs for refurbishment. Received my core exchange refund hours after delivery.
Car has been running fantastic after the swap.
Much credit to Jason at rebuild.org.uk. Highly recommended.