We believe that this particular seat was only available for a short time before regulations for headrests came into being in the USA market in 1969. As can be seen, the flutes on the covers were of a horizontal design and the seat did have a reclining mechanism. If your seat covers are original and you are replacing them, you will definately need new seat foam cushions. The original foam will probably have disintegrated by now and become unrepairable. Check your seat straps too.
Newton Commercial Part No – SC1523