recovering seats

I'm sondering if anyone can help?? I'm recovering my 1969 dart bockets. The foam has metal rods buried in the slits between the foam sections. These rods are what held the original upholstery seams in the right spot. The upolstery actually slid over the rods and the rods sirved as anchors to hold the fabric in the slits. Do these rods become obsolete if I recover the seats with a generic kit?