Choose The Master Kit For Your Gibson Guitar There are three different types of Master Kits available for your Gibson guitar with a "Tune-O-Matic" Bridge. The type you need is determined upon how the bridge mounts on your guitar. Inspect these images to see which type you have. Please note: Because Gibson USA/ABR-1 and Nashville bushing mounted posts do not have threads on the upper bridge posts, Faber® conversion bridge posts are required to mount the Tone-Lock® Bridge included in all Faber® Master Kits. Gibson ABR-1 with Direct Mounted Posts (Vintage/Custom Shop/1990-2003 LP Classic) do not require conversion posts. Used on vintage Gibson guitars from 1957 through 1974, Historic/Custom Shop & various "Reissues", 1990-2003 Les Paul Classic. For Gibson with ABR-1 Bridge 2017 and later Les Paul Traditional, some 2017-2019 LP Standard & Classic, 2020 "The Original Collection" LP, SG & ES series. For Gibson with USA/ABR-1 Bridge Replaced ABR-1 on all Gibson guitars starting circa 1974. Still in use on many Gibson USA guitars, including 2020 Flying V/Explorer/Firebird. For Gibson with Nashville Bridge Faber® "Tone-Lock"™ MASTER KIT - For Gibson Guitars This is the kit to buy to completely upgrade your Gibson Guitar. "Original style" ABR-1 equipped guitars, such as vintage guitars prior to 1974, Custom Shop models, Reissues, and the Les Paul Classic from 1990 through 2003, do not require new conversion bridge posts. All others using a Nashville Bridge, or the Nashville type mounting system installed on the newer NON CUSTOM SHOP models with ABR-1 bridge, will require conversion bridge posts to install the "Tone-Lock"™ Bridge included in the Master Kit. Choose a Pre-made Kit with your choice of conversion posts!