If they are splitting about your only option is to replace. Mine had become stiff and less supple over time and weren't sealing well. Dave Forest, who owns
https://rvcoolingunit.trueims.com/home was willing to walk me thru the steps of bringing the seals back to life with a heat gun and some Vaseline. Long way of saying he is a great source for all things RV refrigerators. Might give him a call. If can't supply them he can direct you to a source for replacement parts.