Where to get replacement bike frame cable entry grommets?
I discover your post because I have a Dengfu frame (recognized it on the photo!) with the same problem. I had a contact with Dengfu (Jame Yang). They can send me a pair for free but I have to pay $10 for the shipping. I found this too expensive and besides, i presme I'll have the same problem after a while. So I just put a nice black strap around the downtube of the frame holding both clips. It's very discreet and cheap!  ;)
Hope this helps and does not come too late!
Rudy