GM Genuine Intake Manifold Plenum Adapter 12555840 – 4.0L/4.6L Cadillac Oldsmobile Pontiac

Need to fix that pesky coolant leak or replace a cracked intake manifold plenum?

This is the genuine GM adapter, part number 12555840.

It's brand new, OE spec, and a direct replacement for 4.0L and 4.6L engines found in early 2000s Cadillacs (DeVille, Eldorado, Seville), Oldsmobile Aurora, and Pontiac Bonneville.

Fits model years 2000 through 2005.

Comes with a 1-year warranty, so you know it's solid.

Just bolt it on and get that Northstar running smooth again.

No guesswork, no modifications—just like the factory part.

California folks, check Prop 65 warning, but otherwise, this is the fix you've been looking for.