There has been some discussion about how swapping a Roadster 5-speed into an RL411 results in the shifter being too far back. I think I figured out -the- solution for this during my install.
I was looking closely at the shift mechanism on the 5-speed, and at pictures of other Datsun transmissions, and I started thinking maybe the "arm" that receives the shift lever could be flipped around 180 degrees. Well, it can. The result is a shift lever that is about 2" further forward:
This does result in the shift lever leaning forward too much, but a bent lever from a different Datsun (not sure which, actually) solves that easily. This can be seen in the above image. With the bent lever, metal and plastic "washers" are needed to keep it from spinning with side-to-side movement. I found an Ebay seller in Mexico who manufactures these. They can also be seen installed in the above image.
With this setup, a 280z inner shift boot works well (along with some sheet metal plate I cut to mount it to):
This cuts down on noise nicely. Finally... after researching what some of the 510 guys had done, I settled on a shifter console from an early 90s Honda Civic:
I plan to go with a nicer shift knob when I find one. The whole setup works beautifully, and the shifter comes out -exactly- where I want it. Hopefully others can benefit from what I've found.