There was a DIP8 version of the M5218L made by Mitsubishi, but they may be hard to source now, so any common dual opamp can be used in there such as JRC4558, TL072, NE5532, LM358 etc.
Info about the original:
Despite its compact size, this effect can put out a richand truly powerful distortion sound which can sustain for very long durations.
Two specially designed Color Mix controls provide for wide ranging tone control.
Whether for solos or for backing, it makes possible a well balanced new age metal sound.