diff seals and oil

[steve8274]

hi
just cleaning all my parts up and decided to change seals at side of diff (of sierra)
do the seals just prise out and new ones slide in or is there anything else i should do. does look straight forward but just want to check first.

also does anyone know what oil is used in diff. drained mine of, then checked haynes manual and it doesnt say what to put back in! oops

any advice appreciated
steve