Most of the time you can use silicon diodes somewhat interchangeably and using a higher rated one will have no adverse effect. I usually only buy 1N4004s (400v) or higher for small diodes since the price difference is negligible in quantity. (pennies per unit if you buy 100).
There are also lots of different kinds of diodes so you do have to be somewhat careful if you are not sure what they are doing but if this is just a small rectifier or used to scrub off the reverse "kick" on a coil just about any silicon diode will work.
