Thanks for the reply mentok.
The first link you gave is where I got my first image from in the original post. The item is discontinued, so unfortunately not much good to me. I'm pretty sure this is the exact mount I am after, as the old frame I have was a 'Da Bomb' Cr-Mo frame (look at the other pics once you have the link open).
The On-One bolt on boss looks ok. I don't care what I use, as long as I can find something relatively cheaply that will do the trick. I reckon I've seen better looking options in google images, but I have no idea where to find them.
I should mention I am in Australia I guess, when looking at availability of parts.
As far as search terms go, "v-brake boss" is where I started, but this generally brings up the screw in posts/pivots if entered into eBay or other similar sites. I need to find the bolt on version as the posts/pivots on their own don't have the little holes for spring tension adjustment. Plus, I'm pretty sure the thread on the posts/pivots is larger diameter than the actual frame bolts - these seem to be similar to disc brake mount bolts (an ~5mm outside diameter bolt fits)? I was just wondering if there is some specific name that might all of a sudden bring up the bolt on bosses I'm chasing
Edit: the 1st pic looks huge on my computer - sorry!