What size tank for my astro hog ?



I have a 12oz. in her now. On Sunday I had to
dead stick her in. I could not believe it but she
was out of fuel. She's just under 8 lbs. ,running
a Saito 82. I have a new 20 oz. tank in the hangar
but I don't think it will fit.

Wish I had a LHS, but don't. Thanks for your input.

Bob