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I'm not familiar with the spectra g, but I'm assuming its gas. If it has a pull start that may make it more difficult for mounting unless you can swithc it to a top mount with a typical starter. If its a 90 sized aircraft, the century 90 should fit it without an issue. The one from heli world. They typically come with a longer than needed e fiberglass tail boom, that way you can cut it down to your individual need. The bigger you can get for fuselage size the better. You can always scale down tailbooms to work with your size. I prefer 90 size fuse for my 50 size mechanics because it is easier to work in those fuses. Hope it helped a bit. If you need further assistance pm me or reply back.