This probably belongs in the thread "FJ40 pics from back in the day". My 01/72, pic taken summer of '78 showing my headrests and my old girlfriend and my brother with his Harley.
FYI the head rests from the later 40 series have different spacing, believe your ‘78 would be the narrower spread, so measure and confirm before you buy.
I am literally in the exact situation as you (1978 no headrests), purchased some off ebay, got 3d printed guides from proffits :oops:, and got some upholstery pliers / staples.
If you wait until this weekend you (and the rest of mud) can find...
When I purchased my 1978 40 series, the front seats did not have head rests nor where there slots to insert them visible. If I run my hand over the top of the seats, it sort of feels like there are indentations beneath the seat covers where head...