FWIW, I'd try a local motor factors.
Brakes International have been where I've gone in the past every time for Mk1 and Mk2 parts and calipers.
But after three separate sets of front brake disks each arrived with different defects, I'd say their source's quality had dropped massively.
The facts were one set had a brake disk had a deformed the outer edge ( looked like had been dropped from height ) with the second set having deep gouges to the disk surface. The third set they alledgedly checked before they sent them but had the same issues as the second set.
At least going to a local motor factor's you can check the disks there and then and there's no hassle if you need to return them.