diff --git a/api/src/main/java/com/github/skjolber/packing/api/SupportedPlacement3D.java b/api/src/main/java/com/github/skjolber/packing/api/SupportedPlacement3D.java
index ec2bd723..3d897f46 100644
--- a/api/src/main/java/com/github/skjolber/packing/api/SupportedPlacement3D.java
+++ b/api/src/main/java/com/github/skjolber/packing/api/SupportedPlacement3D.java
@@ -2,6 +2,8 @@
 
 import java.util.List;
 
+import com.github.skjolber.packing.api.Surface.Label;
+
 public interface SupportedPlacement3D extends Placement3D {
 
 	List<SupportedPlacement3D> getBottomSupports();
@@ -16,4 +18,6 @@ public interface SupportedPlacement3D extends Placement3D {
 
 	List<SupportedPlacement3D> getRearSupports();
 
+	List<SupportedPlacement3D> getSupports(Label label);
+
 }
diff --git a/api/src/main/java/com/github/skjolber/packing/api/SupportedStackPlacement.java b/api/src/main/java/com/github/skjolber/packing/api/SupportedStackPlacement.java
new file mode 100644
index 00000000..7eea82b1
--- /dev/null
+++ b/api/src/main/java/com/github/skjolber/packing/api/SupportedStackPlacement.java
@@ -0,0 +1,16 @@
+package com.github.skjolber.packing.api;
+
+public class SupportedStackPlacement extends StackPlacement {
+
+	private static final long serialVersionUID = 1L;
+
+	public SupportedStackPlacement() {
+		super();
+	}
+
+	public SupportedStackPlacement(Stackable stackable, StackValue value, int x, int y, int z) {
+		super(stackable, value, x, y, z);
+	}
+
+	
+}