I'd measure the diameter and height. and then suss out where thepart was deployed (e.g. secondary side of a transformer, or connected to the mains side of a SM PSU), and then taking into consideration the likely current load and voltage, choose a suitable replacement.
IMHO At the end of the day, if the rectifier can (1) handle the current, and (2) withstand the peak reverse voltage, taking a conservative view on ratings, you'd be hard pushed to choose a device that wouldn't suffice.