Wow.
The original 40 stabilizer was held midway to the fulcrum on the axle side of the center arm, which is going to be far less movement than the position of the factory 60 mount for the same amount of knuckle movement.
Did 60s come with manual steering? Let's just say that I doubt the design of the 40 stabilizer is matched to a 60 box.
The Rough Country design seems like a better method, as it is taking shock out of the tie rod itself, and not trying to deal with a mechanically greater challenge of a wild drag link relative to a mounting point on the frame. In other words, the amount of unwanted bump-steer (oversized tires, and suspension lift) from one side of the vehicle is attenuated by the stabilizer before that force affects the other knuckle, as it is mounted to an actual fixed position on the axle, and not the frame via the constantly cycling suspension system. It would make sense that the stabilizer's has to do less work if can deal with those forces instead of loading them to the opposite knuckle, and you now have two oversized tires that are now undesirably guided away from the trajectory of the vehicle. Ugly parts, they need black paint, and trail dirt, but, I'd consider them.
The ill-fit of the relay-rod hole taper issue would warrant attention. No point having equipment that is a poor fit.