Need help with new insert stove flue installation please

[Quadrafire2]

I have an issue with the flue fitment of the new stove. The new stove is ~4” shorter than my previous one, it also has a slanted back while the last stove had a flat back (the part that goes inside the fireplace. I have a 6” titanium SS flex pipe from the top of the chimney to the bottom, and then I have a 45° elbow adapter. The female part connects to the liner via a ring clamp, and at the other end the male is connected to the inside of the 6” stove flue.

Is there another type of adapter I can use? If someone can show me a picture of how its done on their stove it would be great.

Thanks in advanced.

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