@Travis Hi Travis, Many thanks but I put it in a big press and finally got it to come apart. The spline connection was really corroded from sitting I think outside in the rain. The split ring is there but on the other side of the spider. i have a lot of cleaning to do but I think it will be a good clutch when I am done. Many thanks for the help once again!
I believe its 59302 in the bottom right corner, appears to be splined. I took mine apart awhile back and my manual explained it very clearly. Though our two drive clutches are designed differently .
But i think you're next best bet is going to be a service manual https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=mule+2500+service+manual&_sacat=0