Your #1 Bigsby Retrofit System by TOWNER includes: BIGSBY B6 TOWNER Hinge Plate Adaptor  One 2" Strap Button Screw Four Hinge Plate Rivets (*I will install the rivets for you.) Four Felt Pads *I recommend the 1 inch spring for 335 style guitars because the Bigsby arm, over the archtop, sets the arm a little to close to the body. BIGSBY® B6 with TOWNER Hinge Plate Adaptor The BIGSBY® B6 is preferred for ES-330 and 335 style guitar models because the B6 is longer and suits the longer ES style guitar bodies. The BIGSBY® B6 will come to you already modified for your convenience. The TOWNER System provides a screw-less system and innovation of string control with the down tension bar and the hinge plate adaptor provides a flat surface for all strap button and strap lock buttons. The BIGSBY® “EX-SHORT” Hinge Plate and Hinge Pin replace the B6 Hinge Plate. *NOTES: I recommend the 1" inch spring for B6’s, provides a comfortable distance between the guitar and the Bigsby arm. ‘Some’ ES-347’s have the studs set lower on the guitar body. If so, use the TOWNER B3 KIT because the studs are set further back on the guitar.