I only started importing and selling the combo C/KU CK1s because people wanted to purchase and they were paying too much for the units sold on EBay ($89)!
The greenish color aluminum body combo units that two other sellers are offering are units that I refused delivery last year from the manufacturer. The units were manufactured with no FD scale marking, no vertical "0" skew marking, no "O" ring between the feedhorn/KU bodies (or drainage), the C and KU probes were not aligned with each other on most samples and the KU section was prone to failure when exposed to very low levels of static discharge.
Imagine the headache from trying to provide product and customer support of that build! No thanks!