Heres a little more info for ya, the tow hook option in 1971 cost 19.00, not bad compared to the cost a AM/FM radio the same year 148.55.
The 60 to 68 hooks mounted kinda sideways as they do on todays trucks.
These are the factory hooks on my cousins 63 4x4
Heres a pic of the hooks I just took off an 84 I'm parting out.