Help me finish my fossils!

Hey all, I’m almost done with my fossil exhibit in my New Leaf museum, but it just have three more I can’t seem to find! I’m still in need of:

-Dimetrodon skull
-Apatosaurus tail
-Megacerops tail

If you have any of these, please message me so we could possibly trade! Is ill buy them, or I have some items for trade. If you’re looking for so,etching in particular, let me know and I’ll tell you if I have it.

This would be a huge help!