Going to need to send mine back. Too large, kept falling off. Installed them, big humps. Showing pictures of factory, earlier 914 Rubber and one I got Monday.

That's not good! I'm sure that Mark @mikey914 will make it good. Odd, you'd expect the first one to be the dud. Not the second run.

Check the profile of the rubber there are 2 ways to install it.
The profile has a small step for the lens that makes it fit perfectly around the lens. I install this 1st then install the base into the other slot. Doing so you can make sure you have it in the correct slot. The rubbing is an indication that the base is not fitting on the rubber and getting caught on the step.

If you look closely the profile looks something like this,

Double checked install, they are still too big.

What altitude due you live at ??...Bag of chips syndrome..

Now resolved, new correct size gaskets arrived today. Shout out to Mark for getting on this.

Good job Mark and Mark for quick feedback and response!

And that's why smart 914 owners buy from 914Rubber. Even when they get it wrong they make it right in the end.

Ansbacher (no affiliation)