Thanks guys.
Later yesterday, I went looking online and found another outfit that lists them and intended to call them today. Their web page doesn't say they're out of stock, but that doesn't mean they're not.
Everyone else is, including Amazon.
And I suppose I could try Kuryakyn direct.
This is a picture of Kury #4538 (thanks Brian), and I also need the little D spring clip washer too.

The funny thing is, the (obviously identical) Hwy peg on the other side has been giving me trouble for a long time. It gets all floppy and starts dropping down hitting bumps (the D washer went missing long ago, and that's probably why). I snug it up good but in short order, it's floppy again. I'm very gentle in the snugging (that stuff is brittle and will break) but almost have to make it unmovable by hand to make it stay up. And then the other one breaks.

I use them so little on this bike because of traffic and because if I'm not careful I can burn my short legs on the hot valve covers. The Hwy peg rig on my other bike include offsets bringing them back to perfect for me (and I just never got around to getting offsets on the other bike too).