I don't have one for you but, I also faced a similar issue with my Celestron CG5 which came with two 5kg counterweights which were way to heavy for the scope I had mounted.
I ended up locating some New Saxon Counterweights which had the same shaft diameter as my Celestron counterweight shaft...
Came as a set of 1.6kg & 3.5kg weights for around $80 posted to Cairns, Far North Qld..
Here is a link to Saxon's site... not sure if this is helpful for you or not...
https://www.saxon.com.au/counterweig...mount-5kg.html