Rupp rear sprocket - Where to buy??

#1
I need a 70 (I think) Rupp Roadster rear sprocket and can not find one... Does no one sell new ones? You'd think a part like that would be simple to find. The one I want has the oval holes or cut-outs (I think the 72+ have the round cut-outs). Ebay has a used one like I want but looks rusted / rough. Any help out there??

I bought the twin unknown mini's on eBay and want to add a TC to one. The huge 72T sprocket might be a tad low geared...
 
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