This is a free upgrade for the Mondeo Mk3 Hatchback.
As you will possibly know the rear tail lights comprise of three bulbs, 2 5 watt bulbs and one 21 watt / 4 watt bulb which is dual filament shared with the brake lamp - 21w.
The 4w part is obviously dimmer than that of the 5w bulb.
Having unsuccessfully tried to obtain a 21/5 w bulb with OFFSET lugs, (you can buy a 21/5w with lugs 180 degrees apart - opposite but not offset.
So, get a 21/5w bulb, file off the top lug, the one closest to the glass, then using the original 21/4w bulb as a reference, put the new 21/5w bulb into the holder, the correct way.
And there we have a circle of red light equal all the way around, no dimness, whilst still retaining the 21 watt brake light bulb.
PLEASE CHECK YOUR LIGHTS BEFORE SETTING OFF, ENSURE THE BULBS HAVE BEEN FITTED THE RIGHT WAY ROUND, AND THE LIGHTS WORK PROPERLY. FOLD THE SEATS DOWN, AND YOU CAN SEE THE LIGHTS THROUGH THE BLACK PLASTIC COVERS.