Beard EB-16 Maple/Ebony Spider Bridge Insert – Unslotted (set of 2)

These are pretty much the industry standard, they produce bright trebles with balanced lows.  This is the type that comes stock on most high end resophonic guitars.

Unslotted, can be slotted to a preferred custom spacing that way.  Some final sanding and fitting may be necessary to achieve desired fit.  Works with spider bridge setup.