I’d recommend buying a new one. There is nothing special about the original one that would have been on the car - I think they were made by Harada. Auto parts store should carry one that works. They usually come with a mounting kit that’s just a piece of steel strap with holes in it so you can support the bottom. The top comes with new swivel head and gasket for the hole in the guard.
Here’s an example - a bit pricey. You can go for a cheap and nasty one if you don’t want to spend $150 for the OE style one.
https://www.ebay.com.au/itm/293737076709?epid=1256670035&hash=item44641817e5:g:gbMAAOSwEkxfYWKP
