Brake calipers 96 1.4

Hi, I have a 96 1.4 polo eng code AEX, I have just replaced the front disc's and while doing this I found that the spacer tube for the mounting bolts were a bit corroded and that the white plastic sleeve around the tube was a bit mangled, I cleaned them up and used plenty of coppaslip and refitted them. I went to my local dealership in Milton Keynes to try to get replacement parts, I was quoted £75+vat for the four spacer tubes, four bolts and four plastic liners. Does anyone know of a cheaper source? I have tried Eurocarparts & GSF but no luck as it seems my car was made at a change over time for the caliper mounting method?? and they do not carry the spares!

Thank You