Ive been looking for the same thing for my cortina,

Only off the shelf kits i could find was Hi-spec or K sport,

K sport wanted a 300 quid sur charge unless i ordered 3 kits so i told them to ram it.

Hi-spec could do a 285mm kit off the shelf but said they may get a 305mm depending on what wheels.

If there are other people interested in the same thing may be get some discount for combining an order