Hi "Marko", I'm not sure if there's an alternate seal type for the rear, but we've never had an issue there, to be 100% truthful, we've never had a single issue with the front ropes either with respect to leaks.
I'll put a shot here of how the seal sits in the cover (I believe this may be the gap mentioned in the referenced post above by "tubman"??) It's a really nice fit, I have nothing holding it in place in the photo below, just the very slight press-fit, that's how it is!
Thanks, Gary in N.Y.
P.S. Having said that it sure is a lot easier using the front neoprene's over the ropes, lay them in place, make sure you use the correct sleeves (mentioned above here), and your good to go.