Originally there were straps that attached onto footman loops located on the front top bow and hooks that attached to the top rest brackets located on the panel above the rumble seat lid.
Macs auto gives a good picture of the footman loops. I have an original set on my 28 roadster. Will try and take a picture of then in a few days. Trying to get better, caught covid.
Hello, on my 31 roadster, the top shows some wear at the point where the rubber top rest is against the fabric.If it had a top boot this would have been avoided , it also has no straps to keep it from moving in down position, the few times I have driven it I just remove the entire top , only four screw mechanisms hold it on and go *******.