The earlier T3 models had the coils located under the tank. I did a Google search to try and find a photo and came up with an interesting previous thread from this forum that may help you.
The standard location for the coils on a LeMans is under the left hand side panel like this. You won’t need the box behind them as that is the voltage regulator.
You should be able to mount the rectifier/regulator under the right hand side panel as that is where the standard rectifier lived or under the headstock so long as they clear the horns if you are putting them back there (as shown in the thread mentioned above). This is my Cali 3 which has a combined r/r unit under the right hand side panel.
