General Rear seatbelt retractor mounting

[Rossiter]

His everyone, I hope someone can help. This question is regarding seatbelt mounting points in a formerly camper ban converted fiat Double 1.9 nmultijet 120) 2008/9 - 58 plate.

I have fitted 3 rear seats as currently it only has the driver and passenger seats. I have bought the seats and belts form eBay.
The issue I have is the rear seat belt mounts. I have located the holes for the M10 bolts for the lower and top fixed mounts. I cannot locate the hole for the belt retractor (there is a smaller bolt hole in roughly the correct position but this doesnt seem consistent with the bolts on the belts - arrow and question mark).

I think the person who did the conversion has cut / ground off the retractor mounts (please see pics).

So my questions are:
1) Have the mounting points been removed?
2) If not then where are they?
3)If they have then what are my options for seat belt firmament (welding I presume)

I may be inclined to re-do the camper conversion as I wasn’t happy with it - layout, electrics and quality.

I love the van so will keep it as a 2 seater micro camper if I need to .

Thanks in Advance.

The pictures show the upper and lower M10 mounts and the smaller questionable mount).