Why don't you try to make it yourself? It's quite easy.
Plus, with the aid of doc/item_bonus.txt, doc/script_commands.txt and maybe some online database that interprets the meaning of the item script such as http://midgard-library.org/ (beware it's outrageously outdated but still does its job, just look for comparable item effects) it shouldn't be too complicated. You just need spending some time by yourself the first time, then next time you'll spend a bit less and have less doubts, until you master it and will make item scripts quickly without any problems.