1969 Plymouth Roadrunner headrests

[69roadr]

Got a bench seat 69 Plymouth Roadrunner.
Just received my headrest and attaching hardware. Is there anything that goes down in the seat back that the headrest slide into?
Thank you in advance for any help.
Greg

 

[slimt]

do you have the seat apart? is there a cross tube ? pictures of what your doing would help... Im not sure if that is the same as buckets.

 

[69roadr]

do you have the seat apart? is there a cross tube ? pictures of what your doing would help... Im not sure if that is the same as buckets.

Don't have the seat apart yet. Bought the car with bench seat and no headrests.