Genuine Nissan RB20 RB25 RB26 Lower Timing Belt Gear R32 R33 R34 13021-42L11
These gears often get damaged on removal. They get seized to the end of the crankshaft, and need to be pried off - or worse, pulled off. If you are having trouble removing this gear, we have had to drill a hole into it, and thread it, then use a bolt and slide hammer to pull it off in the worst case scenario - but we've done hundreds, and that's a very small percentage.
Regardless, if you're afraid you will need this, you should probably get one before it's too late. It's reasonably priced for the amount of trouble you will avoid!