Hi folks. The old seals have no place for a spring. I only checked the new ones for size when I installed them. What I installed was a Tekonsha 5603 seal which is what the local RV place
sold me for a Dexter 7 x 1 1/4
axle.
Interesting, I did a google search and it seems that a double lip seal has a spring and is a must for oil while a single lip seal has no spring and is good for grease. Something I did not know. Thanks for bringing it up. Raz