I would guess the unique attachment bolts and links could be fabricated but chains are cheap from the vendors. Here is a shot from 55' and 56' it looks like the cover is black or maybe a dark grey?
https://www.flickr.com/photos/advance-design_parts_co/11471981706/in/set-72157638866517525
https://www.flickr.com/photos/advance-design_parts_co/8258736738/in/set-72157632208905268