They came with disc appropriate mounting hardware (spacers and extended bolts). Prior to that I ran with SKS chromo's and was able to bend the rear stays to clear the rear caliper. It wasn't an issue on the front as the stays could be attached to the mid-fork rack mount points:
The FFs mounted pretty easily and are a reasonable price, and they do an adequate job. However the SKSs seemed much more solid and would have been my first choice as a replacement but I had some difficulty sourcing a pair. The FFs rattle around more especially when riding rough surfaces. The SKSs also have safety release catches on the fronts which some people like.