Believe me i've googled. Anywhere that used to have them no longer does or are located in the uk. The other two you posted are for u-brakes, not v brakes.
Thanks for the fork idea. I used one of these i had on an old mountain bike:I've scavenged a couple of them from the front forks of dump mountain bikes. A dremel cut off wheel or side grinder will remove them. Then I use small U bolts to attach them where I want. With good shoes they make fine brakes on a budget.
SB