They look like the simple "D" bulb seal.... They SHOULD have a small stainless steel screw in the top to hold it from sliding...
Take your finger and pull down the outer portion, run a screw through the back portion and use clear sealant after..
Just make sure the screw is not too long, I think mine were 1/2" ??
2020 3991RD with-
17.5 Goodyear 114's , Titan Disc brakes, MorRyde 8K IS, Onan 6.5..