BJ, you are not alone! Many others have encountered this issue. Once in great while we have been lucky enough to find a broken Clark but that is difficult on our own. I think you will have more luck asking well known harp restorers if they have any (rather than players). They may have some they will be willing to sell – the down side there of course is that they may want to keep them for the future. Some folks to ask who I know have repaired Clarks are David Kolacny, Rick Kemper, and Craig Pierpont – and perhaps Howard Bryan.
You may however find it necessary make them or have them made for you, as several of us have done. If you have the tools – at simplest a Dremel with metal cutting wheels and several files – you can cut them from brass and stainless steel stock available in most good hardware and hobby stores. Painfully slow but not too difficult.
You could of course simply replace them with modern levers, but many would consider that sacrilege. Although frankly it would make the harp better for performance (and I’d bet that Meredith Clark would have done that himself ha ha).
Best of fortune,
Biagio