Maybe you could message Bean if he had any leftover, but typically when he's out, he's out. Could be he's got it on the docket? Not sure though.
Here's the real kicker with the harbinger: the LDRs it calls for are hens' teeth. There are subs listed there on the build doc, however. The circuit and its values are geared around those specific specs of the old NSL ones, though, so keep that in mind.