It looks like SeatbeltPlanet.com wants the anchorage dimensions? The good thing is you don't need old belts to determine this -- just measure your coupe mount points

Dimension "B": from side-lower bolt to side-upper bolt
Dimension "A": from floor bolt (nearest door) to side-upper bolt
Then add 75"

Attach file:

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  belt length.jpg (27.57 KB)

DD
I dont know if it was only on Australian delivered models my mine mount directly from the base of the back window just behind the B pillar. No inertia real ( didn't go to the floor )
This was annoying because it kept slipping off my shoulder so I fitted (VW polo rear seat) retractable ones.
Yes 620mm is correct

Maybe we are talking about two different things...

This is the Front belt diagram: the shaded areas are where the Front seat belts (shoulder belts) mount

* early: on B-pillar
* late: above side glass, aft of B-pillar

Looks like some Australian coupes mounted it in a 3rd location

* below side glass



Early coupe (Japan)



Late sedan (Australia)



Early sedan (Australia)

That top photo is of my Coupe with the VW polo Inertia reel fitted.
Originally came straight from the mount on the back window base , over the shoulder to the buckle , then over the lap to the inner sill.