I was heating the fretboard on on a ''71 ES335 with a badly damaged neck so I could hopefully remove and reuse the original fretboard. To my surprise the block markers started to melt. I thought they were mother of pearl but apparently not, I guess Gibson used plastic not MOP. Now I have 2 markers that need replacing. I'd like to re-use the original fretboard and this means replacing the 2 damaged block markers. Does anyone know what the orignal is and where to get it?