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There is 2 versions...the SCT diagonal and the standard 2" diagonal that simply slides into all 2" focuser such as the williams you mentioned or any other 2" focuser.
The SCT diagonal has a thread that will screw onto the visual back of your SCT...you probably wont want this diagonal if your planning on having a 2" focuser.
Go with a diagonal that has the standard housing for 2" focusers....which is the most common diagonal.
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