A bit more info on your Winsdor Dover may help, maybe a pic?
You seem to need a 1" threaded fork for cantilever brakes. but I have no idea which length steerer you need. Also you need to make sure the fork is suspension corrected or whatever the correct term is, otherwise the geomentry of ypour bike will be slightly off.
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk