Modding Request: Galaxy Horns

I'm recreating the mighty nein and these are perfect for Mollymauk, but I have ts4 not ts3. If no one wants to convert it, pointing me in the direction of how to convert specifically an accessory from start to finish would help, since I can only find partial tutorials (usually on how to export ts3 meshes/textures but not what to do with them afterwards).

The only download link I could find that still exists is below, on a russian site (suggest to use ad block and the automatic google translate to make sure you don't click on any ads). It's called 'Galaxy Horns' by leahlillith.

sims3pack.ru/aksessuary-dlya-sims-3/dlya-zhenschin/5817-roga-kosmos-ot-leah-lillith.html

Thank you for any help!