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I have done some more research and found this:
The Prologo saddle light thing is actually another system that attaches to the top with a clip.
The Specialized SWAT system is actually 60mm apart and fixed with M5 bolts.
Bontrager actually also have a system, mate that works at a Trek store will check dimensions of that. But looks like it is also fixed with M5 bolts.
This will be something proprietary that I just can’t seem to find. Might need to contact Prologo about it directly.
I swapped out my Prologo Scratch for an SLR test and found these two holes at the underside of the Prologo, M4 thread and 55mm apart.
Anyone know what these are for? Looks like it could be able to mount some kind of bracket for a light or whatever. But the internet is not spewing any usable results (or my search skills are too weak)