Have seen these type of seatbelts fitted to Series 2A Station Wagons. They had a seat belt bolt with an extended square section (instead of the hex head) with a hole though the extension. A shackle with the bolt going through the hole then accepted the belt end latch. Have some of the bolts somewhere and will have a look for them.
Have a look in a Series Parts Catalogue in the Seat Belt area or an LR Optional Equipment Parts Catalogue - I recall they may be illustrated somewhere.
Bob



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