What do you mean, T5 set? End caps? Bulbs? The end caps are all standard -- its just a mogul to fit the bulb end... and bulbs is 100% subjective. Theres a HUGE selection of T5 bulbs available, with the large majority of them being actinic/supplemental. Reading is in order, cuz its the only way you'll get a grasp of what you're looking for.

http://sites.google.com/site/tfivetesting/

-Justin