I'm thinking to just go ahead and use my 90 CM dish for Ku band with my Titanium Ku Band PLL LNBF and forget about the dual Ku/C LNBF. I already have a steel fence post and 180 LBS of concrete mix for a stable mount for the 90 CM dish. I just need to dig the hole. The Ku dish combo got most everything I wanted when I used it before. The 120 CM dish didn't do that much better on Ku band.
My spare DMS 2100 motor is apparently dead, so I'm on Ebay and other places looking for another motor for the Ku dish.
The nice part of this next install is the unused cable input for my place is about 30 feet from my new 90 CM dish location, and it connects to my AV junction box indoors, same as where my 120 CM dish enters. I can put a switch there to select between the two dishes. There wasn't enough room for the C band dish there.
The new Ku dish location is also mostly out of sight of the street, so somewhat low profile. Fortunately, I have just enough clearance with a offset dish that I can see the Clarke belt just above my neighbors roof. We get extreme winds around here at times and I have a tile roof, so not a great place to mount a dish. The roof edges aren't much better. OK for a little Direct TV dish, but not a 90 CM or larger dish. Ground mount seems the only way to go. I'll add a photo when I get it all installed.
Thanks to everyone for the help and advice.
A Raine, I've done a bit of metal bending in one of my former jobs. Aluminum is easy enough to work with using just a good vise, a rubber mallet and a plan. The part of the bracket with two sheet metal screws showing is to keep the plastic C LNBF mount from rotating. I would have liked to make the whole mount out of aluminum, but that would take a lot more bending.