See the
brackets mounting the scalar to the home-made LNB support arms?
They are a creation of Caddata, and have been built by a number of
members.
I suggest you make your own longer LNB arms, and mount a flat scalar on 'em with those brackets.
You won't actually -use- the scalar; it's just a way to mount the LNBF.
Make sure it is located as far away from the dish as possible, while still getting the signal focused into the mouth of the LNBF.
edit: Looking again at PopcornNmore's pix above, maybe you can just use the existing LNB arms.
Now, since the feedhorn near the dish is clear, slide on a flat or conical scalar, and tune for maximum smoke. - :up
Even a flat scalar may be tested without notching it.
Here is one way to know where to put your own LNB on your own support arms.
First, put a Ku LNB on your stock dish, then
make the template.
Install your own LNB arms and feedhorn, and locate it accordingly.