Is it possible to put the rear headrests from a later Mk3 into my earlier mk3?

I want to fit them so it's safer for my kids.

Is the frame work there in the seat? Would I only need the headrests and the plastic fittings to do so or do I need to modify the internal frame?

on my '89 caravelle the frame work was all there and just needed to cut holes in the fabric and fit the plastic tubes and then the headrests. Hoping it's the same with the golf.

Thanks