Just an update on the above.
Gabriel customer support have been excellent.
I have been liaising with them and have sent pictures so they can see what I am dealing with.
It's got us stumped but Gabriel have not given up and are looking into this as they have never come across this issue with their product or at least it hasn't been reported and documented.
Original lower coil mount/anchor point.
https://postimg.cc/877bkSdH
Gabriel lower coil mount/anchor point.
https://postimg.cc/CzPNV185
Note the difference in the location of the mount between the two.
Like I have said, they haven't given up so hats off to them and credit where due.
Not here to bag the product as I do feel it is a superior product to others out there in the market. From their research, it was noted that other manufacturers have the anchor point in the same location as theirs yet the OEM is different by approximately 90 degrees.