I don't think anybody makes one. You can find a stock one and send it to Leanna and let her powder coat it for you. She doesn't have chrome I don't think but she can come pretty dang close.
The chrome-replica powder I use is called "Super Chrome." It would probably be fine for a differential cover as long as the rest of the axle assembly isn't already chromed. It looks good on its own but I can't recommend its use on parts that are visually close to real chrome -- you can tell at a glance that it's not the same stuff.
Though this vintage ride is for a slightly younger crowd :-D, you can get an idea of how the Super Chrome looks.
