roll bar fitting

[Paulprior]

. Mine is the other one on eBay and they look similar, here is a pic from inside the car where a garage had tried to install it, it's just above the outrigger corner, I couldn't find anything to bolt it too but I also realised the outrigger corner had been replaced and maybe if you moved the angle of the roll bar the front mounts would line up somewhere else, it seems odd that the rear mounts connect ok, there must be something for the front ones?