ok, so years ago i had a Muddy fox Alu Pro, see pics, yes that my skinny self! think it was a 19", is it a 1990? 1991? either way if you have one that you are willing to let go, frameor bike that would be awesome, any condition considered as it's bound to get a repaint!
I have one like this in the attic (be it with the blue-ish original forks) and I believe it's a 19". Most parts original (complete Deore DX groupset) except for tires and saddle. Well used and a bit neglected by the former owner but structurally sound and no dings or dents.