Nobody to my knowledge makes a top, one pops up here and there. Normally told just have a local shop, yadayada,"any upholstery shop can do it". Some reference photos here:
https://bringatrailer.com/listing/19...eplica-427-sc/
Note center forward bar in third photo in the sequence (never seen that) any close inspection you see the bars slip into each other like most cobra tops.