Nobody makes them new, but there are a few places that rebuild them if yours are worn out. Have to watch eBay if you don't have a set of cores, figure on spending $200-$300 for a complete set depending on condition. Also make sure you have the correct bolts that hold the hinges to the hood, can't use regular bolts there.
Check with 51Gringo. He is a HAMBer and his shop rebuilds Merc hinges, maybe he has a set for sale also?
Or try Owens Salvage,Flat-top Bob. He's got all kinds of stuff. Another place might be Papke Enterprises in Hunington Beach,Ca.