8 3/4 rear axle seal question

So after cleaning things up and although the bearings look fine the outer seals seem like a loose fit on the axle and I'm thinking I've gone this far so maybe change them, I haven't done this before buy looks pretty easy and I have a press but do I have to damage the collar that holds the bearing in place to get it off? If so does anyone know the part number? I see the green bearings come in a kit with new collars maybe because there different? I'm not sure if I want to go that way or just stay with stock style bearings.