Ball joint boot polyurethane upgrade?

Hi All
Golf front ball joint boot has failed MOT (no longer prevents the ingress of dirt), and I have heard of some polyurethane replacement boots, which should be more resilient.
An anti-roll bar linkage ball joint also failed with identical symptoms.
Two questions, please, relating to either/both components - has anybody fitted these polyurethane boots?; what sizes will be required for 2008 Golf Plus 1.9TDi?
All thoughts welcome.

Why do you want to mess with replacing the boot alone when you really need to replace the entire ball joint? If the boot failed, the joint will be contaminated with sand and road grime, and it will wear out very quickly, so replacing the boot will not extend the life of that part by much. My suggestion is to buy an OEM ball joint, replace it and be done.

Agreed^.... the failure rate is fairly low and the prices are good on aftermarket.... by the time you take the time to try to reboot it you could replace it!

I wasn't clear

Thanks for all replies.
It was not about money, or the effort and time involved - I thought that polyurethane would be more resilient, and was considering going around the car, upgrading each ball joint.
Time of year being what it is, having to do any repair work outside, I am awaiting the new joints before popping them on.
If anybody has experience of the polyurethane boots I would still like to hear from them. Thanks.