You might think about rewinding your own coil .
I rewound my headlight coil with excellent results .
I unwound the original wire onto a tomato wire cone , loosely ( you may have to find something bigger ) .
Then sprayed a couple of coats of paint on the wire . Let it dry and then wound that wire back onto the steel core .
Of course , I paid attention as to just how the wire came off the core , so I could apply it in a like manner .
I could see were the thinner wire of an ignition coil would present a problem , unless you made a decent jig to preform the task .
Pete .