£140?? really?? Guessing that your size is 205/50/17

Just found 205/50/17 93V for £96 delivered so that would be roughly £111 fitted per corner, so £444 for a full set.

Are 17"s the smallest you can go down to? as you can get205/55/16 91H for £58 delivered, £73 fitted, £292 a set

Also, what is the car your fitting these to, Is it a lexus? as all i can work out from your first post is that its RWD.

The site I used
http://www.oponeo.co.uk/