You'll find our Vintage Copper 3x3 heads.
We start by 10mm diameter. Then 80 to 88mm. Our SKU start by those two number (10- means 10mm as modern guitars ; 88- means 8.8mm as Fender vintage)
Then the next number refers to the fastening system. 1 = standard (135°) ; 2 = screw down ; 3 = Gibson vintage ; 4 = diagonal ; 5 screw 180° (only for Schaller M6 180) ; 6 = screw down on left as Schaller M6 mini ; 7 = no screws . At the end, machine heads on plate.