See if you can find any books or web references to a Brit called Gerald Wingrove.
He has scratchbuilt an amazing number of car models, and he makes everything himself. I hope you have good eyesight before you start, 'cos you may not have by the time you finish!. Another source may be the aftermarket companies, making stainless steel wires. I imagine a good auto model magazine or even FSM will have adverts.