Installing headrests on 69 Cuda non-headrest buckets

it is really hard to find 68-69 Barracuda bucket seats with headrests as they were not common options at the time these cars were built.

i have two sets of black buckets for two of my cars that i want to put headrests on. i also have the headrest components and chrome bezels that the headrest assemblies fit into. has anyone ever installed a set of headrests on a non-headrest seat? do you have any pics or can you offer some advice or guidance?

thanks...
jim coster, pittsburgh, pa