Manual top hold downs

Hey Folks, I have my 65 Vali top held down with ropes at the moment. In fact they seem to pop out past the housing. I'm new to the forum and will surf the forums about that... Also, any idea what these little buggers go for? Old Fart's design looks pretty smart. I'll call Layson's like Chewy Suggest. I'm about to get the car soon and anticipating handling this issue.