Any old UF4007 is going to be just fine. Your local parts store may carry NTE parts, and the NTE575 is equivalent.
In a pinch, you should very easily be able to find the following diodes at the local electronics shop that will also work OK:
1N4007, 1N4006, 1N4005
There are hundreds that will actually work, but only a couple that are as good or better performing than the UF4007.