Rear Seat belts '64 Daimler 2.5V8

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I want to fit rear seat belts in my 1964 Daimler 2.5 V8- to accommodate my grandchildren
Without me stripping out the rear seats ( I have a wedding very soon) can anyone tell me are there pre-drilled/tapped rear seat belt points ? If so are they suitable for inertia belts ( i.e. are there also points on the rear seat upper back/top ) or drilled only for only static belts
Vehicle chassis no P1A4369BW
any info much appreciated- will strip out post wedding but forewarned is forearmed !
Many thanks
Colin

[JAGAZ]

I think that you will find that they are like my 420 and only allow for diagonal only,statick belts with fixing points already provided by way of plated /threaded hole on the parcel shelf near the rear roof pillars and underneath the rear seat in the center either side of the transmission tunnel.If you wished to use 3 point inertia reel belts then you would have to add another plated and threaded fixing point at the top of the door apperture/wheel arch area either side of the rear seat base.
I have seen this done with the inertia reel fitted on the parcel shelf and the fixed end on the wheel arch area and the catch mechanism fitted in the centerseemed to work well and the owner said the only thing to be wary of was that the metal buckle was not trapped in the door apperture as it makes some nasty dets/scratches in that area.Don`t know what belts were used but a trip to the scrap yard with a few measurements should be easy enough as most cars are a simsilar dimension in the rear.
Hope this helps,JAGAZ.