Hi All and thank you for the replies,
Maggie is in the bodyshop having some cosmetic work so I can't take a picture of the brackets [Wife + Granite Rock = Sill scraped
].
The ones we need are the plastic ones that go on the side of the deflector and slot into the parts shown in the link richandpaula kindly provided.
Our 2001 Stepspeed has only covered 36k and is nearly 100% original so keen to get as close to the original part as possible.