Well the stock A4LD transmission is the same for the 2.3 except for the dowel pin size on the engine , and that is easy to be made , so really the only thing you need is a flywheel , ask Duchwagon if he can hunt one down for you , they came in the sierras and Scorpios over there with the 2.0s , then its a bolt in , or check E-Bay England or UK
Or burton power, I brought a few things for my 2.8 V-6 from them, send a e-mail and ask, or just collect everything and do it at a later time ,