Pry 'em out, try not to destroy the seal on the diff housing.
a good pop with a pry bar should pop them out, is a spring clip that holds them in, but, some times the clip doesn't play nice, and it becomes a fight, you end up shearing the clip
If this happens, you may want to pull the diff and retrieve remaining pieces of clip, cuz they will eventually eat the gears and or bearings. ( it's a Murphy thing )