you know how these have wiring for the LED, and they usually slide on? what happens when you have need to make 10 turns to screw it on instead? the wiring is going to be twisted around the gear stick till it snaps.
unless perhaps you screw it on, with the boot surround unlclipped, then when it's on, connect the wiring to 12v?
just something to think about.
they look great though. will be waiting to see how the guinea pigs go