https://kitfoxaircraft.com/images/se...ins/SB-54A.pdf
This has the part numbers as well as the service bulletin.
I had a KF 4 and I just finished my KF 5. I did this service bulletin when I still had the 4. My 4 had the mounts that looked like what you show in your pic. They are totally different than the Lord mounts I used on my KF 5 Round cowling…