The 16" original wheel trims are around £13 from Ford
The 16" steel wheels are the same as the FIVE STUD Mondeo wheels and can be got for a £10 without tyres from a breakers.
205/55V 16 tyres are around £70 - 80 a piece unless you can do better
Ypu may be able to offset some of this by selling the orignals
54 Plate 1.6 TDCI LX ~aspiring to be something else