Man, don't open that first link, 10 minutes to load, 10 minutes to unload, 10 minutes to reboot computer.
From what I saw, you want a Peerless 2 x 6L6/6550 type output.
4400 ohms centertapped to 16/8/4 ohms might work.
Figure about 1 to 10 mh per ohm, so maybe 8 to 80 henries pri inductance depending on how much bass you want, with 348 ohms dcr end to end.
I have one I'll sell ya for 200 bucks.
Otherwise, cheap, non interwoven generic stuff if your on the Dave Davies budget.
Maybe a guitar transformer if you don't need 20 to 20 freq response.
If you want to run a PA system for a battle ship, horns strung on a 70.7 volt line, I have just the transformer for you. A WeCo Model 5214, circa 1940.
Now here this....Now hear this..... We will be leaving Iraq immediately.
Free Beer in the Mess Hall. :razz: