Universal ISO adaptors are available and you should be able to wire it in to your new HU harness...but since its an aldi special..not likely to find a direct compatible ISO plug...unless its manufactured by one of the majors..not likely...
Just hard wire the bugger in...its not that hard anyway...positive from ACC usually red...yellow is direct to battery (fused)...black is earth...you might have a blue (amp trigger)(or elec antenae)...and another (orange?) for illumination...
the rest are speakers..f left f right r left r right..and they can easily be identified with a 9v battery...


good luck...

dino