spider gear

'99 wrangler Sahara I'm 80% sure I have a Dana 35, but I can't find replacement spider gears that have this rear spline, which suggests to me that a previous owner did something different with it. It has 20 outer splines, 27 inner splines and 15 teeth. I am so lost and just want to get my Jeep...

Looking to purchase a differential as a whole or even just a decent set of spider gears. My ring & pinion and carrier are fine but my spider gears are shot.