Reading the question/anwers at the bottom:
Q: Hi my names steve and interested in the wheels, I presume they are 15" cosworth one's and not the 14" escort one's .Ta stevie N
A: wheels are 14 inch as described - came off a sierra that had been made cosworth replica...

Can't see anywhere on the ad where the wheels are described as 14", so I believe you have good grounds to withdraw your bid.

Good luck m8.