67 bench with no headrest or shoulder strap

If your 67 has the coat hooks directly above where the side windows meet you will need to forfeit those hooks to install the shoulder belt anchors. If the coat hooks are about 4 inches further back then your car is a very late 67 and the shoulder belt anchors are present in the earlier coat hook position. I can offer roof anchors and instructions for their install but, I will not accept any responsibility or liability related to their use and/or performance.
I can also offer headrests and all related parts and pieces from a 1973 bench seat. Again, I will not accept any responsibility or liability related to their use and/or performance. If any of this interest you,
pm me.