Right Byron - finally managed to grab some pictures showing (hopefully in sufficient detail) the mounting brackets, where the OE Seatbelt is mounted, and the eyes for the harness mounting points. Also a couple more pics showing the height of my seat - it is fairly low but I like that about them personally.
Excuse the detritus and generic mung around the seat - not had a chance to hoover the car (or clean it tbh) in a while - the wee boy keeping me on my toes currently!
Outer side Mounting Point and brackets:

Inner Side Mounting Point & Seatbelt Pretensioner:

Side Pic for Height:

Front pic just so you can see generally what they look like in the car
Mine has the Tillett alcantara inserts, and also an occupancy sensor mat in the bottom of both driver and passenger seats, so the pretensioners and airbags (and the seatbelt warning beep) all work as normal still.

Let me know if you need any more details mate, happy to try help best I can
Excuse the detritus and generic mung around the seat - not had a chance to hoover the car (or clean it tbh) in a while - the wee boy keeping me on my toes currently!
Outer side Mounting Point and brackets:

Inner Side Mounting Point & Seatbelt Pretensioner:

Side Pic for Height:

Front pic just so you can see generally what they look like in the car

Let me know if you need any more details mate, happy to try help best I can