Im running 2x.250 DOM 2X.375 is availible. For what you need 1.75x.120 would be more than enough.. I Have a few diffrent end joints on my jeep, but I like the johhny joints the best. you can get them to fit where a stock jeep bushing was at.
For what you are doing somthing like this would be good.. Weld on johhny joints on one end, threaded ones on the other. OR you could just make them weld on both ends.