The following quoted from my earlier posting:
The Mudguards I fitted are SKS (I think that's the old Bluemels, though that name doesn't appear anywhere) Velo65Mountain, 65 being the mudguard width in mm. Both the front and rear guards are "waisted" slightly to fit through the forks and seat stay. The front of the rear mudguard clips round the seat tube and is held with a heavy duty grommet round two lugs. I haven't experienced any issues of interference with the front mech. which was mentioned elsewhere. For the front forks, I initially used 35mm stainless steel P-clips with a rubber liner but subsequently changed to lined 32mm P-clips with the fixing of the stay clamped between the two ends of the clip. The mudguards were bought from Westbrook Cycles, Stokesley, North Yorkshire and IIRC cost about £17. In addition to being an excellent bike shop they have a significant on-line presence.