90520-ZVP-000 Gear Shim C - Overview. The 90520-ZVP-000 Gear Shim C is an essential precision component within Honda marine engine gear assemblies. This genuine OEM gear shim functions as a spacer, maintaining exact gear alignment and ensuring smooth mechanical motion within the gear system. It is designed specifically for Honda marine applications, supporting critical gear systems to keep your engine operating reliably and efficiently. By maintaining proper spacing, it helps prevent premature w