Measurements look good :thumbsup:
The headrest have a tube with a metal spring retainer clip holding them in the seat. Remove the 4 screws down into the seat and they come right out. Phillips shorty... The 2 screws going up into the headrest just hold a plastic cover piece on. it is a moulded plastic assembly. Rods do not come out of the headrest
So is that seat from another car you are working on?