Would either of these fit? Two different mudguards. Sizing is minefield.
I'm guessing 2.0 on my tyre is 2" which is just over 50mm, or have I misunderstood the 2.0?
They're worth it. Anyway, as a rule of thumb you want at least 5mm and ideally 10 mm extra width for your mudguards, so for a tyre that is about 50mm wide you're looking at 55 to 60mm mudguards. You can probably make the 53mm SKS works, but they're not ideal.
Berthoud make a 65ob x 60mm.