The pauldrons of my Custodian Knights available separately for kitbashing. (Check the link for printed and painted pictures).
I prefer having identical looking pauldrons on both shoulders, but you can mix and match them and there are 3 less-ornate looking ones to put on the left shoulder as done by other brands in their plastic models, which allows to paint squad markings or other colour differentiations.
Both pre-supported .stl files and unsupported .obj files included for each piece.