If your after brighter rear lights, or your small twin bulbs keep blowing when your missus slams the back door, remove the lens and bulb holder, get some wire snips and snip the plastic into one large hole which allows the fitment of twin "larger" bulbs that are brighter and dont seem to blow as much.

Anyone else done this, only done it as i had 1 back light, a box full of large tail light bulbs and not one small bulb.

And I thought there's just one standard 5/21w stop tail bulb fitted into a D1 or 2