I run River Raider front and rear. Stood the entire weight of the Jeep on the front on a rock going up Crawler Ridge at Rausch Creek (OOPS!
)- not even a drip of oil out.
Most aftermarket covers WILL seep some gear oil, by the way- be ready for that. Pretty much anything out there is good. The big things to look out for are the thickness of the steel, and the mounting hardware. I also run a Lubelocker gasket- works like a champ- Mark W.