diff --git a/core/src/net/sf/openrocket/file/openrocket/savers/FinSetSaver.java b/core/src/net/sf/openrocket/file/openrocket/savers/FinSetSaver.java
index ef6c25212..5da1cd877 100644
--- a/core/src/net/sf/openrocket/file/openrocket/savers/FinSetSaver.java
+++ b/core/src/net/sf/openrocket/file/openrocket/savers/FinSetSaver.java
@@ -3,6 +3,8 @@ package net.sf.openrocket.file.openrocket.savers;
 import java.util.List;
 import java.util.Locale;
 
+import net.sf.openrocket.rocketcomponent.FinSet;
+import net.sf.openrocket.rocketcomponent.position.AxialMethod;
 import net.sf.openrocket.util.MathUtil;
 
 public class FinSetSaver extends ExternalComponentSaver {
@@ -28,6 +30,22 @@ public class FinSetSaver extends ExternalComponentSaver {
 			
 			elements.add("<tabheight>" + fins.getTabHeight() + "</tabheight>");
 			elements.add("<tablength>" + fins.getTabLength() + "</tablength>");
+			// TODO: delete this when no backward compatibility with OR 15.03 is needed anymore
+			String offset = "center";
+			double offsetVal = fins.getTabOffset();
+			switch (fins.getTabOffsetMethod()) {
+				case TOP:
+					offset = "front";
+					break;
+				case BOTTOM:
+					offset = "end";
+					break;
+				case MIDDLE:
+					offset = "center";
+					break;
+			}
+			elements.add("<tabposition relativeto=\"" + offset + "\">" +
+					offsetVal + "</tabposition>");
 			elements.add("<tabposition relativeto=\"" +
 					fins.getTabOffsetMethod().name().toLowerCase(Locale.ENGLISH) + "\">" +
 					fins.getTabOffset() + "</tabposition>");
diff --git a/core/src/net/sf/openrocket/file/openrocket/savers/RocketComponentSaver.java b/core/src/net/sf/openrocket/file/openrocket/savers/RocketComponentSaver.java
index 176993f18..97dfd97eb 100644
--- a/core/src/net/sf/openrocket/file/openrocket/savers/RocketComponentSaver.java
+++ b/core/src/net/sf/openrocket/file/openrocket/savers/RocketComponentSaver.java
@@ -83,6 +83,10 @@ public class RocketComponentSaver {
 				// no-op.  Instance counts are set via named cluster configurations
 			} else {
 				emitInteger(elements, "instancecount", c.getInstanceCount());
+				// TODO: delete this when no backward compatibility with OR 15.03 is needed anymore
+				if (c instanceof FinSet || c instanceof TubeFinSet) {
+					emitInteger(elements, "fincount", c.getInstanceCount());
+				}
 			}
 			
 			if (c instanceof LineInstanceable) {
@@ -103,6 +107,13 @@ public class RocketComponentSaver {
 			final String angleMethod = anglePos.getAngleMethod().name().toLowerCase(Locale.ENGLISH);
 			final double angleOffset = anglePos.getAngleOffset()*180.0/Math.PI;
 			elements.add("<angleoffset method=\"" + angleMethod + "\">" + angleOffset + "</angleoffset>");
+			// TODO: delete this when no backward compatibility with OR 15.03 is needed anymore
+			if (c instanceof FinSet || c instanceof TubeFinSet) {
+				elements.add("<rotation>" + angleOffset + "</rotation>");
+			}
+			else if (!(c instanceof RailButton)) {
+				elements.add("<radialdirection>" + angleOffset + "</radialdirection>");
+			}
 		}
 		
 		// Save position unless "AFTER"
@@ -110,6 +121,8 @@ public class RocketComponentSaver {
 			// The type names are currently equivalent to the enum names except for case.
 			String axialMethod = c.getAxialMethod().name().toLowerCase(Locale.ENGLISH);
 			elements.add("<axialoffset method=\"" + axialMethod + "\">" + c.getAxialOffset() + "</axialoffset>");
+			// TODO: delete this when no backward compatibility with OR 15.03 is needed anymore
+			elements.add("<position type=\"" + axialMethod + "\">" + c.getAxialOffset() + "</position>");
 		}
 		
 		// Overrides