DMX relay quartz oscillator

hi. i got this kit and it worked fine, only now i’ve accidentally snapped the clock crystal off the board (screwdriver mishap…) and one of the leads is torn off the oscillator completely.

is there a suitable replacement part from any US supplier? i can’t source the caltron chip (20mhz HC49U i believe) here in the states.

thanks

Any crystal running on the same frequency will do the job.