String Tree Replacement for a Univox Hi-Flier Phase III

Hi!

I recently bought a Univox Hi-Flier Phase III from Reverb and one of the string trees is broken. Any ideas what kind of tree I should replace it with? It’s a bat wing/butterfly type tree. All I can find is fender type string trees which are wider than the original. Any help would be appreciated. I’m a total newbie to DIY guitar repair!

Thanks guys!
Nick

 

The left “wing” has broken off the string tree on the left.