I'd mock one up in cardboard, or thick paper... Get the look your after....
Then ask a skilled metal fab/sheet metal tradie for a price.....or get a copy made of any others you may know of....
Assuming your talking about the front external ones?...took me about 18mths to find mine, they pop up on gumtree and ebay now and again....there were 2 about 2 weeks ago here in Adelaide on gumtree, just check they have been sold....you can still get the mesh ones https://roofrack.com.au/product-category/general-accessories-2/windscreen-sunvisors/holden/
when I was looking I ask if they made the solid ones, they did but were special order and cost about $600 with shipping... think they are made in NSW....