30 tudor front seat question

[Tacoma Bob]

OK I decided to re-upholster our Tudor. The old interior appeared to be a cut and sew and in it's day was a very very good job. I don't think it was original. In any event ....The front seats had the valence ( some call it a flap) that goes from the backrest to the seat cushion. My question is this. How was the valance attached to the backrest? What I took out was so tattered the a PO had used common fancy upholstery tacks. I checked the JS and the web with no luck. Thanks guys! TB