how can i tell a S4 front iron from a S5? i tore down a motor to find that at the bottom of the orange o-ring groove it decided to fall apart. i am gonna go pick one up tomorrow and i just needed to know what to look for to distinguish the S4 from the S5.

any help is appreciated. thanks

 

OMP mounting point and oil drain location (if turbo).

 

not the front cover, the front side housing (intake housing)...