Bro,
Sorry for the late reply.Did not read this thread a few days already.
I assume you have a FL set now.
If you have and you are using back the casing,then remove whatever you do not need.(tube holders,starter,ballst,and FL tubes.
Depending on how many tubes you are installing you can buy the right eballast for the tube you are installing.
So far Osram EBallast is the most common one use for the T5 HO tube.
You also need to get the T5 tube holders.And of course your T5 tubes.
I think that is all you need not forgetting to get the require wire.
Regards
Sherman