I made my own mounting bar for the side window. https://talk.newagtalk.com/forums/thread-view.asp?tid=802321 
Then you could use one of the various RAM mount cup holders anywhere along that bar as well as having a place to mount a phone with the X Grip type RAM mount. https://www.amazon.com/RAM-MOUNTS-RAP-B-417-400U-Level-Small/dp/B01MS1QFLZ https://www.amazon.com/RAM-MOUNTS-Self-Leveling-Holder-1-Inch/dp/B000WJ3GLE https://www.amazon.com/RAM-Mount-RAP-B-417BU-Level-Diameter/dp/B01N2Y8ZJQ | 
Sounds guard cab cup holders.
