Will these caps fit my valve cover directly, or do I need adapters?

These caps are designed as universal dress-up pieces. Test-fit them on your valve cover threads first — they may require adapters depending on your engine's valve cover boss diameter. Most modern covers use standard sizing, but confirm fitment before installation.

Do these need to be painted or sealed before I install them?

The polished silver finish is ready to install as-is. If you want a different color or want to match your engine bay, you can mask and paint them with automotive spray before mounting — just avoid the threaded portions so they still seal properly.

Are there gaskets or seals included to keep oil fumes from leaking?

Gaskets are not confirmed as included. Most valve cap assemblies rely on a rubber seal inside the cap itself. If yours are missing internal seals, pick up replacement gasket caps from your parts supplier to ensure a tight seal on the valve cover.