Moroso
Perm Align Valve Cover Gaskets for Small Block Mopar
These are intended for Chrysler LA small blocks, but are useful for Magnum engines also, particularly when you want to run LA valve covers. The stock Magnum gaskets will not fit under LA valve covers!
Of course, these are great for LA engines, doing a great job of stopping the leaks on the as-cast valve cover rail that have plagued Mopar owners for years.