The duo will take on a co-captain role for 2019, filling the shoes of the retired Wendy Frew.
Crampton (27) had been the side's vice-captain last year and has been part of the Steel squad since 2012.
Meanwhile Selby-Rickit is now the oldest in the team at 29 years old and brings a raft of experience.
Both were influential in the side's title winning performances over the past two seasons.