Welcome to the forum.
A quick look shows Aztronics stock all the items except for the diode, and i found no information on the diode part number listed, so i am unsure on what is so special about that diode.
You might like to send the boys at Aztronics an email asking about the parts, as they are a helpfull bunch there and will do mail orders, in fact some are members of this email@example.com
From my fiddling with flyback transformers the ones out of the OLD TVs are best (old wood boxed TVs) and often if you take the chunk of PCB around the flyback there is suitable transistors and diodes on the board that can be used.
Put your finger in the wrong spot and you will know why they are called flyback transformers. (more like rip your arm off transformers to get away)
If this is any help, here is the circuit design I am using: http://leoricksimon.blogspot.com.au/200 ... river.html
But obvioiusly this fellow has shortened the component codes because the A1015 transister is actually 2SA1015, or at least that is what I found in Multisim.
I have found plenty of A1015s and C1815s on tv circuit boards, but it would be nice to have some new ones with the full leads for testing purposes.
Was just looking up the datsheet for a RGP10J diode and it seems to be equivalent to a TVR10G (600V, 1A, 30A). I just pulled some of these off a circuit board.