Thank you everyone. I looked up Unisia and found the right one for my '98- about $45 from Amazon. More pricy than the typical Ebay units but far less than if I purchased form Subaru.
When i removed the old one, I compared the two and they have the identical part #, so the Unisia Jens is true OEM.
The trickiest part was getting it to line up with the hole and getting the bolt started. I could barely get two fingers on the bolt head, but eventually I got it. When I started it up,m it cleatred the CEL on its own and didn't come back on a couple mile drive, so hopefully good to go.