I'm glad you enjoyed the thread. Does a little more knowledge make you a little more dangerous :-) ?
I bought my 1995 Sovereign
in 1998 and never considered the possibility that the 1156 bulbs in all the lights might not be stock. The main difference that pops up for the 1141 vs. the 1156 is that the 1141 uses1.44A where the 1156 uses 2.1A. So the 1156 should be brighter and hotter.
It's easy to get low/med/high out of LEDs. My recommendation would be to use either the voltage regulator or the current regulator circuit shown above rather than just resistors. The current regulator works well for a 12V
battery and 3 LED's in series. The voltage regulator will work for a 12V
battery and 3 or maybe 4 LED's in series. The LM2941T IC costs less than a dollar. It doesn't take much room and will protect the LEDs from high charging voltages. If you use just resistors, your LEDs will vary quite a bit in brightness, being either too bright (and maybe burning out) during charging) or unnecessarily dimmer when the battery is low.