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When I wanted to replace the seats in my '04 Ranger, I spent some time with a tape measure looking at many cars. I finally settled on leather power seats from an '04 Altama and welded up aome adapters from scrap angle-iron ...... looks good, feels good.
Any reason you can not add 3 pt seatbelts to the 1970? I put them into my 1971 F-100 without too much hassle and left a short article in the 67-72 forum.