I want to install the newer inertia-type, 3-point seatbelts in the back of my 4-door 1967 122. I wanted to know if anyone else has done this and what your experience was. I've found the places to attach the belts but as I understand it they were meant for fixed belts and so the retractable-type with the inertia-reel may have some trouble fitting. I saw one documentation online of a guy attaching them to the wheel housing in the trunk.

Has anyone been able to get them to attach in the cabin, without serious modification?

Thanks in advance!

There's a how-to published on volvoamazonpictures.se but it's probably the one you're refering to since it instructs fastening to inertia reels in the trunk. The problem with fitting the reels inside the car is that the only place to put them is on the shelf behind the backseat which requires two things:
1) the inertia reel must be designed to release the belt also when the reel is mounted in a lying down position (as is the case on the shelf), which far from all reels do, and
2) the shelf must be reinforced in order to be able to withstand the strain of an adult during a collision (many states/countries have mandatory inspections of cars and the car would not pass such an inspection without this reinforcement)
In addition to this, the reels will be visible on the shelf.

Brgds,

Fredrik
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What did you use for front seat belts to replace otiginals?