Originally Posted By Cab_Burge
Those two pieces are stock on all LA SB Mopars I've worked on, they go in the cap to seal the main cap mating surface to the block scope up
Don't throw them away tsk


No that is not what they are for......

The Mopar B and RB share the same rear main seal as the Slant-6 and the part in question is for the Slant-6 application retainer seal.

Curious as to what brand rear seal that is and where you got it?