I had these wheels mounted as QR for a long time, and wanted to continue using them on my more-modern gravel bike. I took a shot at getting these end-caps to see if they worked, and they did. Fit perfectly.
The adapters fit the hub and the Rockshox perfectly.
I have a 15x100 TA spank oozy front wheel. They discontinued the hub and no longer have the 12X100 caps. Searched high and low to no avail! But came across these an saw they looked very similar to the spank end caps, and lo and behold they work perfectly! (I suspect the spank hubs are actually SRC's or at least share a common OEM supplier for end caps.) YMMV, but I'm very happy to not have to rebuild my front wheel with a 12x100 hub.
Well, didn't know it when I purchased it, but the 20mm front kit is for taking 100mm hub to 20x110mm spacing. The problem was that I had a boost hub, but an endcap was lost in shipping. Luckily the bicycle shop owner used his lathe to take the NDS cap down 5mm and added the same shoulder.
Hopefully they will get the boost kit up soon.
needed to convert a front wheel from 100 X 15 to 100 X 12, as the front wheel has and SRC hub these caps allowed me to change it to 100 X 12, just, by hand, pulled the old caps off and put these on, that's it, very simple conversion