Danny Banh of DB Engineering also manufactures and sells conversion parts for AOD/T5/Tremec/T56 changeovers. In shopping around, I found that the prices for the conversions (overall) weren't too far from each other. I would recommend you ask around and find out whose components were easier to install and worked best.
I believe Dark Horse also provides components, but I don't have contact info for them.
DB Performance Engineering
2602 N. San Gabriel Blvd Unit C
Rosemead, CA 91770
(626) 572 6029 FAX