What parts do I need to fix this?
 

I was hoping someone would be able to provide me with the part numbers for whatever went in here. Looks like a rubber seal and possibly a crush washer of some kind? Also, if you've had to make this fix before, did you have any issues? Thanks.

https://www.miataturbo.net/attachmen...ine=1370154356

https://www.miataturbo.net/attachmen...ine=1370154356

Since you cant see everything in the picture. This is where the drive shaft connects to the rear differential. When I bought the car the seller mentioned a "jingling" sound. Drove it home after buying it and noticed oil coming from the diff the next day. Thought it was one of the axle seals, but nope. The leak was coming from the spot in the pictures as well as the "jingling" sound (That notched metal piece was knocking back and forth from not being secure). Can't believe it made it all the way back honestly, but before I get it back on the road...I want to fix this.

Pinion seal and damper. The damper is unnecessary, I remove them from every diff I build now since I've had one come apart. You'll have to remove the pinion bolt and flange to get the seal out, which will require going into the diff to set clearances again.

If you've never set a diff up before, it's either time to learn how or find a shop to do the job for you.

Thanks for the info...much appreciation!