My transmission shipped with a truck bell housing and the generic tube fit fine. When I received a Camaro bell housing the tube didn't come close to fitting. I Ordered a tube and dipstick for a 2002 Camaro. I still had to bend and modify the Camaro part. If you use the Camaro tube you will need to test fit/modify with the engine/transmission not installed in the car. I had to remove the engine and transmission in order to make it fit.
BTW - I still don't have a solution to seal the TC from road dirt. I figure I will tackle this the next time I remove the engine.
Tube - 12552595 - 17.11 from Rockauto
Dipstick - 12560267 - 16.27 from a local dealer
A far as the engine is concerned everthing has been hooked up except the cruse control and temperature guage. I have not found a good location for the temperature sender. I'm using the stock GTO guage and sending unit. I am able to check several engine paramerters by using a Scan gauge.
http://www.scangauge.com/