So as per Stucs thread remove headlights and grill.
Bring the lights indoors, here you have a choice.
Either put the lights in the cooker and warm to 65 degrees or leave the lights to soak in hot water.
Pros and cons of both are that the lights won't melt in hot water if you get the temp wrong or put the grill on. But if your reflectors are peeling as they are old the water can cause them to drop pieces.
I went hot water... You choose, I'd probably go with cooker if I did it again.
You will get longer working time if you use the cooker.
Once warm the mastic will give and the lense will come off.
Once off the led strip fits like it was made for the bongo between the reflector and headlight case.
Touch of decent superglue or similar holds it on at the grill end.
Feed the wires out the bulb hole and through the vent holes in the bulb rubber.
Run + to the fog light + and - to earth posts behind each headlight.
If you want you can reseal the headlights with a silicon or acrylic sealant you can and pound shop has decent stuff in small quantities if you look carefully.
Here's the link to the eBay item
http://www.ebay.co.uk/itm/250943608154? ... EBIDX%3AIT
Benefit is that while you're in there you can clean the reflector mine was filthy.