End cap for maxspect gyre xf

Is there an end cap available for the XF350? If not, will the end cap for the XF330 also securely fit on a 350 since the 350 is 4mm wider in diameter? Can the 350 still function with one end of the pump removed as it’s slightly too wide if I put it horizontally on one end of my tank where my overflow weir is located on back left corner?