The DC-11 crystal type had been replaced before war's end by the mechanically and electrically interchangeable CR-1A/AR, which is also used for the AN/ARC-1, -3, -5 VHF sets and many other places as well.  The CR-1A/AR is THE most common military crystal that is to be found anywhere...far more often than a DC-11.

There are also a few CR-1B/AR units around, but those were made to relaxed electrical tolerances, are scare, and are less desirable in general.

Mike / KK5F