This is regarding Toyota P/N 48609-22070 (factory Toyota only) strut mounts.
The bearings are a Nachi 6302 without seals. Nachi also make a sealed version
I have no idea if they have a retaining compound on them, but if you know what you’re doing they should be replaceable. If yours are knocking or creaking replacing the bearings would be an economical alternative to getting new mounts.