Try Aliexpress.com. I've successfully replaced a torn [https://www.aliexpress.com/item/Flat-Cable-Repairing-Cable-for-DJI-MAVIC-PRO-Gimbal/32795961446.html?spm=2114.13010608.0.0.UESauM|gimbal ribbon] and a [https://www.aliexpress.com/item/DJI-Mavic-Pro-drone-accessories-gimbal-vibration-absorbing-board-parts-shock-absorber-damping-frame-bracket-hanging/32796759470.html|vibration absorbing board], without any technical knowledge or expertise, other than replacing a few iPhone screens. You can find the flex ribbon (nicely wrapped and put in a plastic box) for around $14 and the vibration board (it was boxed as an original part) for $20.
If I can do it, anybody can. You just need some patience, the right tools and some informative videos from youtube.
https://www.aliexpress.com/item/DJI-Mavic-Pro-drone-accessories-gimbal-vibration-absorbing-board-parts-shock-absorber-damping-frame-bracket-hanging/32796759470.html
https://www.aliexpress.com/item/Flat-Cable-Repairing-Cable-for-DJI-MAVIC-PRO-Gimbal/32795961446.html?spm=2114.13010608.0.0.UESauM