Things in this hobby move on so fast that it is always a good insurance policy to buy a spare frame and/or some of the spare parts for a frame that are most likely to get damaged such as a few spare arms and a top plate. Just something to keep in mind for the future. I usually buy at least a couple of extra spare arms.
If you can't find replacement parts or another complete frame of the same anywhere then your only options will be:
- Reach out to iFlight support and ask if they have any new-old-stock top plates for that quad kicking around in their factory or stock cupboard somewhere.
- Try to find someone who can cut you a new top plate from some carbon fibre sheet. You might need to provide your existing broken top plate as a template, or create your own CAD file by copying the design using measuring tools and CAD software and then sending the carbon cutting company those CAD files.
- Try to find someone who is selling a used quad of the same and use it for donor parts.