Thankyou Mo,
Very helpful. I guess if it came from the factory with 3 front seats then it must have different belt plates to what I have on mine. So that doesn't help me unless I try and find a set from a scrapyard, or import new from landrover if you can even get them. (i'm in Oz btw). I just wonder how legal it would be to bolt the aftermarket belt I have into the larger bolt hole along with the plate that's already there.
I suppose with the original plates the force applied from any impact would be spread across the 2 bolts, however if I just attached it to the one bolt there would be greater strain on that bolt, so whether an engineer would be happy to pass the modification for us we will have to see, though I doubt they would know any different anyway to be honest.