Those parts where typically hammered into a forming body (aka a mold) for low volumes, or stamped in a press for high volumes.
You could try creating a forming body out of a chunk of oak (don't waste your time with pine, it's too soft) with the exterior profile you want, then slowly hammer a sheet of metal into the shape of the oak. Lots of hand work and patience, but that's how it was done. The mold needs to be a little "tighter/smaller/sharper radius" than the final shape you want since the metal will "spring back" some after you form it into the mold.
English wheels are generally for larger parts like fenders, etc. But you might be able to do a small part like this with one. But they are quite expensive.
You might get somebody with a press to make a hollow forming body (mold) and then use a very stiff rubber ball to press a blank into the mold, but I doubt anybody would want to be bothered doing that for a few pieces (you need 3 corners correct ?). And it often takes several tries to adjust the mold shape to generate the desired final dimensions.
I did a restoration that was originally sheet iron over a wooden frame. I used "galvanneal" (a special type of paintable galvanized steel) so the moisture in the wood would not rot out the steel. It had mostly straight line folds and some drip edges. I did it with hammers and wide folding tools.
Check out these folks, they have exactly the tools that you need;
http://www.eastwood.com/panelbeater-san ... t-kit.html
And some other general purpose sheet metal forming tools that will come in handy;
http://www.eastwood.com/autobody/hammers-dollies.html
Good luck, the good news is that you are making a "new" part and sheet metal is fairly "cheap" (whoops I meant "inexpensive"). So you can try a few things until you perfect your technique and get several good replacement parts. It's a bit more nerve racking trying to restore that original 1920's fender....
Cheers, Kevin
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