Planning the next
AO Silver Member
Join Date: May 2007
Location: United Kingdom
Definitely go for 0.8-1.0 mm2.
For the seal, you'll need to measure the diameter of wire/insulation and select the seal colour. Or, look inside the holes in the connectors you have and try and see the colour.
I really don't think your eBay link is the fan connector. They are TE (AMP) Superseal connectors and the terminals are only rated to 14A ( IIRC ). So hopeless.
I think the headlamps are Metri-Pak 150 and the radiator may be Metri-Pak 280. If you don't have the radiator connector, I'll have a look at my car when it's light.