I also have been having trouble getting hydraulic brake pads from Rad. You can't order them online and their phone service is slow and dense. In 2 long-hold calls full of wrong info (they said each set of pads was good for both wheels but actually only for one wheel, they said the little spring clip would be included but neither it or the cotter pin ever is, etc., they said they would ship them fast but shipped the tiny envelope via ups ground and it took almost 2 weeks) anyway, I ended up with three wheels worth of pads for $75, and no clips or cotter pins. Mind you I started out looking for 3 bikes worth of pads and still don't have them from Rad. So I started looking around and in 2 days I have received this 4-pair set from Amazon that seem to be exactly the same size , thickness and similar pad material, which included clips and cotter pins for $15 delivered. 
So unless these fall right apart we are getting ripped off and wasting our time with the expensive and hard to get Rad Nutt pads. Sorry I can't see how to size the amazon images smaller.

PS- Maybe someone can tell me how to post a hosted camera pic. I tried using imgur links and the images don't appear, tho links to amazon images work. I'll post a pic of what I got and how they look next to the Rad pads If I can.


https://amzn.to/3f3Gu5S





Edit 8/25 I also had ordered this other set from Amazon and they seem perfectly similar also for $11 for 4 pairs of pads with clip and cotter pin, came in 3 days




https://amzn.to/3dH7bNl