I assume you're talking about an old style V70? Seats/mountings are basically the same as 850. Haven't started my conversion yet but front seats seem to be a better fit in the 240 than 900 series seats. The frame/rail design make the entire seat sit a bit lower and rail spacing looks more narrow - that's really good news.

I prefer modifying the seat frame to use original 240 mounts instead of going into the car body with the welder but I can't see this job being more difficult than adapting 900 seats. Consider the special arrangements with airbags and belt tensioners, though.

Rear seat is a different story. The wider seat will require modifications of the inner fender and some ambitious work with all mounting points. I'll update my site when the job is completed but I'm pretty sure this is not going to happen in close future :-(.

Martin
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'65 121, '73 165