I have a set that used to be sold by Trek under the Bontrager name. They came stock on my 2006 Trek Portland. (And are part of the reason why the market dissed the Portland, because it didn't come with full fenders.) I was delighted to find they're now available on the open market, and that you can buy the front and rear ones separately.
BBB RoadProtector Guards, MUDGUARDS ROAD
(I've been purchasing stuff from Ribble for years now without any trouble at all. Even bought the frameset for my three-seasons commuter there, see the "My Bikes" listing. I have new three-seasons tires for the spring on their way right now.)
The mount is held on by the brake caliper. You need a bit of clearance under the brake for the mount. (No, I don't have a caliper to measure the clearance required, but there's between 1 and 2mm between the mount and the tire now.) The fender itself uses a bayonet QR to attach to the mount. It's a "beavertail" type of fender, which means it's stiff enough to require no other support.
Once the mount is installed, it takes longer to type "mount the fender" than it does to actually mount it.
I prefer full fenders on my commuters, so I use mine on the Litespeed with Dura-Ace 7800 brakes and a 25mm GP4000S tire underneath. Here's the bike showing just the fender QR mount hanging behind the rear caliper. Sorry, no pics with the fender installed.
It keeps the spray off my back, but does nothing at all for people behind me, or about splatters on the backs of my legs and shoes from spray hitting the seat tube. Doesn't keep the bike itself any cleaner either. But it goes on and off much, much faster than a Raceblade, doesn't require any fussing to keep from rubbing, and offers about the same coverage.