If you have not already, I would wrap up the busted array ASAP to prevent water from getting into the wave guide or pedestal. Unless its indoors, then that would prevent the problem as well.
XN10A/3.5
XN12A/4
XN13A/6
The same three antennas cover the entire DRS product line. AX and NXT radars can use either of the three antennas. The length will tell you the part number, 3.5 feet, 4 feet, or 6 feet.