So - now I'm stuck with the missing seat collar issue...
Looking for one as pictured above, so I can run some cantilevers please...
Why, oh, why, oh, why did they do without a braze on solution???? Surely not to save money or weight??
My God, he pays £30 for an Explosif and he expects perfection, I don't know, some people, honestly.
I've got a cable guide of the later type, but it wouldn't fit over your seat tube because of the braze-ons, and the ones you need must be quite rare.
Nothing to stop you using a clamp-on V-brake stop of course. And if it was me, being a cheapskate, I'd just stick a bit of carbon frame protector to the end of the top tube and glue 5mm of outer onto it. Not that I've tried it TBH, but it only needs to be a guide.