Do you still need the spindle bearing seal or is that not needed with the bushing?

• I bought your extreme spindle bushings and before I mess them up. Do these work for chevy small bearing spindles? The id general
• Will these bushings fit spindles/axles for a 78 f250 D44? fitment
• After replacing the bearing with this bushing do you still need to putl the very small seal in that goes behind the bear general