Will this knob thread onto my shift rod without adapters?

Most standard shift rods use the same thread pitch, but your rod diameter may vary. Test-fit before final install — bring it to the shifter assembly and confirm it seats properly without forcing.

Does this come with a set screw or any fastening hardware?

The knob itself comes ready to install. You'll need to confirm what fastening method your shift rod uses — set screw, threaded collar, or pin — and have those on hand before assembly.

Can I polish this further or does it need prep?

The silver finish arrives polished and ready to mount. If you want a different look, standard metal polish will work, but no stripping or surface prep is required out of the box.