I have purchased a 2004 Colemane powermate 5500 generator to replace a 4000w generator which had expired during the northeast ice storm of 2008. I have a 6 circuit Geran transfer box connected to my main panel. My question concerns the hhokup/plugin to the generator. The line from the house is a 4 prong connector which does not mate up with the generator since it has 2 120v outlets and 2 240v outlets.
How do I connect the genertaor to the house to utilize full output of the gennie?
I'm hoping there is an adaptor of some kind but haven't located anything close to what I think would work.

Thank you