Another idea that will be scorned by purists
I don't know about anyone else, but i'm sick of pulling the lenses off the tail light to change a blown bulb, only to have the lense leak water when it rains, or over-tightening it to stop the leak & breaking either the lense or the housing...
The solution? Why not drill a set of 25mm holes into the back of the housings & fit up a set of the "twistlock" fittings used on most japanese cars, then seal the lense to the body with silicon?
At the very least when you're filling up at the servo & notice that a lamp has blown, you don't have to screw around looking for tools that you know you've left in your shed to change the bulb... Simple open the boot & undo the fitting by hand

presto, bulb changed.
Also, it has the advantage of being able to fit the high intensity LED bulbs if you wish, meaning you won't have to change bulbs again.
Bad for originality, i know, but it gives people something (else) to do on a rainy weekend
