NotABeeGee

Does anyone know where I can get a replacement arm for a lo-TRS bridge on an Ibanez RG450AH? The original arm has been missing since before I bought the guitar, and I'm looking to finally get one. I'm not certain which arm I need or how to install one. I did see an archived discussion regarding TRS-101 arms on this site, from about 2008, but all of the links posted then are now broken. Any help would be greatly appreciated