Gold string ferrules (6) for the top surface of string through body guitars. 5/32 diameter.
VANSON 6 x Gold High Quality Smooth Guitar Ferrules / Mounting / Strin – Vanson Guitars
Guitar Madness 6-Pack Gold Guitar String Ferrules Rear Mounted Small 5.2mm Pressure Fit
Genuine Tone Ninja Guitar Ferrules, Gold, Set of six (6)
Aftermarket
Large Guitar Top Mount String Ferrules - Philadelphia Luthier Tools & Supplies, LLC
Musiclily Pro 11mm Steel Top Guitar String Ferrules String Through Body for Telecaster Strat Electric Guitar, Black (Set of 6) - AliExpress
La Bella Deep Talkin' Bass Gold Flats Electric Bass Strings - 6-string
BSF-L-G (4) Long Barrel 3/8 Bass Body String Ferrules - Gold
6-String Guitar String Adapter – Peter Weiss Designs