I have a set of new (never used) Teleskop-Services Guidescope mounting rings that suit scope diametres from 34 to 85mm. Cast rings, with nylon tipped screws, as shown here:
https://www.teleskop-express.de/shop...-to-85-mm.html
Asking $30 plus $10 postage anywhere in Australia. If your interested PM me here at IIS. Photos attached.