It's called windlace. I got mine from Automotive Interiors, but there are dozens of upholstery suppliers out there.

 

 

Roy,

Here's what the windlace looks like for a car like yours and mine. It is tucked in, tacked on, screwed in, and glued on, depending where you are in the car. Very time consuming, but the results are worth the effort.

You'll need a lot of contact cement, so I included a picture of it just in case!