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Your 'scope has a 2" focuser so go with the 2" extension not the 1.25" one so that you can use it with 2" eyepieces. You can still use 1.25" eyepieces with the 2"-1.25" adaptor you should also have. Note the extension tubes come in different lengths; 35mm, 50mm and 80mm. You more than likely only need the 35mm one as the 50mm one may be too long. Check with the supplier of your telescope.
To test put a 2" eyepiece in the focuser and pull it out as far as it will go and still be able to be locked. If you can get focus then measure how far out the barrel is and over what part of the focuser travel you are operating over, I.e. Middle, racked in or racked out. You can also test this with a 1.25" eyepiece if you have but note the thickness of your adaptor in any measurements.
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