If youv got a cheap 17mm ratchet spanner just weld a flat piece on
Granted the ratchet mechanism will be slack compared to the others but youl save yourself a few quid
I bought an 8mm one! all I need know is willpower
Never seen a spanner like that, but what about useing a nut or bolt with a flange, like this:
View attachment 179721
Draper expert spanners with the switch to reverse direction have a lip on them & they come with a lifetime guarantee.