Never held these in my hand or fitted them , on any bike , but since you are ordering stuff shipped in from elsewhere ..
I have seen these and there seem to be a number of adjustments .. the set screw may work to compensate for spring balance
Grand Cru Zeste Cantilever Brakeset - Brakes - Brakes & Parts - Components
they may be un branded TRP.. VO often buys the same parts others get like in black ,
but orders the makers to supply them with a polished version.
With the ones you have they used a V type shoe, you dont have to use them replace them with something else.
even the one above , you can change the pad inserts from what it ships with.
another option
http://bike.shimano.com/publish/cont...-.br_road.html
the brake pads also can be mounted differently .... thinner spacers . ,
the pivot off set may work for you & your frame Pivots spacing.