I don't know about a rebuild kit. I had a small leak in about the same area. In my opinion, when it comes to brakes, I wouldn't rebuilt one, so I bought a rebuilt one.
I bought mine from Brake Systems Inc. Portland OR 503 236 2116. Part number
RV2771494X. It is made for RV's. They had it in stock and knew exactly what it was when I walked in with it. There is no sales tax in OR.
2020 Renegade Verona
2021 Grand Cherokee Trailhawk
2020 Ram Laramie 3500