The metal spacer didn't fit my G4. It looked like a raw casting, not precision. Luckily I was able to use the old one. The fan sits looser on the shaft than the original. Would have paid for a refund so just kept it. Suspects may not be original parts. Installation Tips: Read how to replace the fan online. A 9mm key to lock the shaft is essential. There are 6 different types of screws. I had a large box lid and I placed the screws and marked on the box where they came from.