The guides that I make are only fitted to the rod section that is added to convert a 12' light switch rod into a 14'6"wafter.
This section can be added when the switch rod is set up without having to re ring the line.
When the rod is held in the right hand the line is looped through the guides with the left hand. Likewise, a left hand held rod will have the line looped with the right hand.
These guides are single leg and because they may get pulled around a bit, the seat has to be longer and wider than normal. Stainless steel spring wire is not good for cold swaging so I have to forge the seating and file to shape. I've made simple jigs to shape 3 sizes so far. Time consuming to make but fortunately there are only two fitted per rod.
Seriously - this RH, LH stuff is a bit gimmicky, however, extending the rod to enhance the action of the top dropper is definitely not.
I'll take some pics tomorrow.