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I know they do 60/65mm guards, I have the 26" version, just hadn't seen the 20" ones for sale in that size anywhere.
Might be worth mentioning though that I'm really not a fan of the 26" x 65mm ones. I think the weight of that big a guard is too much for the wee skinny steel stays so I found they bounced around and rattled and rubbed really badly.
700c versions will surely be heavier and with even longer stays so I don't think they'd be something I would want to use.
And yeah, coverage on the 26" x 65mm ones is rubbish, defnitely need a flap.
And just so its not a whinge about SKS guards in general, I have 700 x 45mm Longboards and love them, they don't bounce or rattle nearly as much.
Hopefully the 20" version will be lighter and the stays stiff enough to keep them from rattling too badly.
M_Vatwork-
I actually think Flinger make better mudguards than SKS when it comes to wide stuff. I've fitted their 26" x 60mm guards to two of my bikes, they have extra thicc stays. Also they come with the mounting hardware attached already which is one of the fiddliest bits of setting up SKS guards. Big recommend.
Belagerent
I have some in both 60mm and 65mm. I think the newest addition is 700x60 and 700x65.
I bought my first set of 26x60 more than three years ago.