the vr6 MAF needs to be from an OBD II car, early OBD I housings won't work.
AGU or VR6 sensor is fine, whichever is in better health, same part.
This is AGU only info though, as the sensor bolts are 90 degrees different to later AUM/AUQ stuff, which require S3/LCR/TT MAF housings for larger turbos
