I have two barbary sheep horn caps without the skull. I was wondering how best to display them. Any advice is appreciated.

Taxidermist could probably still do a horn mount, or possibly a shadow box?

You can probably find another skull on ebay.

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Find or shoot a cape and do a shoulder mount !

Or on a serious not look at a Euro short skull mount....

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I ended up buying a deer antler mount kit and modified it. I shaped some hard Styrofoam to fit the core and glued/ drilled it into a cedar board. Looks good.