How many using an A500 overdrive ?

I am getting ready to dig into my 42RH w/lock-up over the winter. I chose it over the 46RH due to low 1st gear and HP loss. Plus I currently run a 904. Do A500 and A518 rebuild kits come with parts for the OD unit included?
What about torque converter selections for internally balanced 5.9? Who is a good source?