I replaced the plastic bridge pins on my GS Mini Koa a few months ago with the ebony/abalone that Taylor supply. They went straight in no problem. To the eye the ebony pins look wider and shorter, so I measured the difference to see how far apart they are. So taking the head as the external part seen when fitted, along with the lip at it's base, and the hidden part as the shaft -
head diameter ebony 7.75mm plastic 7.4mm
lip diameter ebony 7.15mm plastic 5.95mm
shaft under lip ebony 5.35mm plastic 5.2mm
shaft end ebony 4.2mm plastic 3.5mm
total length ebony 26.6mm plastic 30.35mm
The lip under the head is absent where the slot is on the plastic pins, but is complete all around on the ebony.

