Tudor rear seat backrest

[fiftychev]

I'm very new at upholstery. Ive removed all of the old upholstery and am ready to start reupholstering. The back rest of the rear seat does not have a wood base. The old upholstery was simply hog ringed to the springs. ID this correct or is there supposed to be a wood frame. The seat seemed to fit just fine the way it was but I'd like to do it right. It's a 1930 if that matters.

Thanks for any advice you can give.

 

[Barber31]