Hi Jonk,
You are probably better posting questions like this at the lab (there are many helpful people there) or maybe in Geeksluts... but here goes...
All of the below transformers will do the trick:
CMOQ-1H, CMOQ-1L, CMOQ-2H, CMOQ-2L, CMOQ-2S, CMOQ-3H, CMOQ-3L, CMOQ-4H
I'd stick with one of the CMOQ-2's the letters are indicative of what the core is made out of so S - Steel (more distortion / fattness), H - 80% Nickle to Steel (more hifi / pure), L - 50% Nickle to Steel (kinda inbetween the S & H). All of these transformers will let you do 1:1, 1:2 or 1:3 ratios.
Cinemag is a great company to deal with, their prices are very reasonable & they take paypal & don't mind dealing with small orders...
So just get some

(PS I have no affiliation with Cinemag heh )
Justin