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I'm not sure how successful you'll be using the stock standard OAG with a Newt Ian. I would be surprised if you can achieve focus without moving the mirror forward or finding a really really really low profile focuser.
You might want to consider the low profile Starlight Xpress OAG. it has a significantly thinner profile than either of the two others.
Getting them to attach to the newt could be a challenge as well seeing as OAG generally come with an SC thread and you'll need an SC tread to 2" bayonette adapter (often called an SC Adapter)
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