I bought a Fel-Pro BS40656 rear main seal for my small block (the basic 1 piece rear man seal on Summit). I took my old seal off a while ago so I don't have anything to reference. The old seal had a spring around it, but I can't find a spot to put it that looks right. The only thing I can get it to go around is a small lip on the flywheel side of the rms housing, but it doesn't look like the spring serves any purpose.

Thanks!