Changing the color of my Tru-Glo fiber-optic sight (on my daisy pellet gun)?

my powerline 880 by daisy came with a stock red color fiber optic TRUGLO front sight bead, i was wondering if i could change out the red fiber optic bar for a bright green one (just preference). Please, i have no clue to how to do this, and where i can order them/ and i dunno how to swap them out. thx.