The chrome hubcaps were an OPTION and only on the Lo Pro models with certain rims and only during the Sunset years. They go back to 1966. Many of them just rotted off the rims. I have a 130 awaiting restoration and there isn't enough left of the two rear caps to make up one hubcap. The fronts are long gone.
I know that Deere and Cub Cadet also used them and it would surprise me if the design was the same. Therefore, I suspect that aftermarket caps are now available but I also imagine that the price might make you pause. I've never pursued trying to find them but perhaps oldcasecoltguy or horton20 have some thoughts on this since they have produced several aftermarket Case items on their own.
I know that Deere and Cub Cadet also used them and it would surprise me if the design was the same. Therefore, I suspect that aftermarket caps are now available but I also imagine that the price might make you pause. I've never pursued trying to find them but perhaps oldcasecoltguy or horton20 have some thoughts on this since they have produced several aftermarket Case items on their own.