headrestAxle = 20;
headrestAxelsCenter2Center = 150;
headrestSeatbackDepth = 60;
headrestMountWidth = 210;
headrestMountHeight = 50;
boltHoleWidth8mm = 8.5;
boltHeadSize8mm = 10;
washer8mmOuter = 16;
PerimiterOffset = 3;
OffsetExtrude = 4;
OuterCamfer = 4;
MountEyeHeight = 20;

$fn=100;

difference() {
    // Main piece
    cube([headrestMountWidth, headrestSeatbackDepth, headrestMountHeight]);
    
    // Left axle
    translate([headrestMountWidth/2-headrestAxelsCenter2Center/2, headrestSeatbackDepth/2, 0])
    cylinder(headrestMountHeight, headrestAxle/2, headrestAxle/2);

    // Right axle
    translate([headrestMountWidth/2+headrestAxelsCenter2Center/2, headrestSeatbackDepth/2, 0])
    cylinder(headrestMountHeight, headrestAxle/2, headrestAxle/2);
    
    // Right bolt hole
    rotate([90,0,0])
    translate([headrestMountWidth/2+ (headrestAxelsCenter2Center/2)-  (headrestAxelsCenter2Center/6), headrestMountHeight/2, -headrestSeatbackDepth])
    cylinder(headrestSeatbackDepth, boltHoleWidth8mm/2, boltHoleWidth8mm/2);
    
    // Right bolt head countersync
    rotate([90,0,0])
    translate([headrestMountWidth/2+ (headrestAxelsCenter2Center/2)-  (headrestAxelsCenter2Center/6), headrestMountHeight/2, -boltHeadSize8mm])
    cylinder(headrestSeatbackDepth, boltHeadSize8mm, boltHeadSize8mm, $fn=6);
    
    // Left bolt hole
    rotate([90,0,0])
    translate([headrestMountWidth/2- (headrestAxelsCenter2Center/2)+  (headrestAxelsCenter2Center/6), headrestMountHeight/2, -headrestSeatbackDepth])
    cylinder(headrestSeatbackDepth, boltHoleWidth8mm/2, boltHoleWidth8mm/2);
    
    // Left bolt head countersync
    rotate([90,0,0])
    translate([headrestMountWidth/2- (headrestAxelsCenter2Center/2)+  (headrestAxelsCenter2Center/6), headrestMountHeight/2, -boltHeadSize8mm])
    cylinder(headrestSeatbackDepth, boltHeadSize8mm, boltHeadSize8mm, $fn=6);
    
    
}