diff --git a/src/frames/pieces/extended/front-or-back-clean-for-extended-side-windowed-backslashes.scad b/src/frames/pieces/extended/front-or-back-clean-for-extended-side-windowed-backslashes.scad
new file mode 100644
index 0000000..1979c08
--- /dev/null
+++ b/src/frames/pieces/extended/front-or-back-clean-for-extended-side-windowed-backslashes.scad
@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: © 2024 Brian S. Stephan <bss@incorporeal.org>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+include <parameters.scad>
+include <components.scad>
+use <frames/pieces/box/front-or-back-windowed-backslashes.scad>
+
+module backslashes_windowed_front_or_back_box_frame_piece_for_extended_side() {
+	difference() {
+		backslashes_windowed_front_or_back_box_frame_piece();
+		// ...minus the frame wall and lip on the left
+		translate([-frame_x/2+frame_wall/2, 0, 0]) cube([frame_wall, frame_y, frame_z], center=true);
+	}
+}
+
+backslashes_windowed_front_or_back_box_frame_piece_for_extended_side();
diff --git a/src/frames/pieces/extended/front-or-back-clean-for-extended-side-windowed-forwardslashes.scad b/src/frames/pieces/extended/front-or-back-clean-for-extended-side-windowed-forwardslashes.scad
new file mode 100644
index 0000000..021072f
--- /dev/null
+++ b/src/frames/pieces/extended/front-or-back-clean-for-extended-side-windowed-forwardslashes.scad
@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: © 2024 Brian S. Stephan <bss@incorporeal.org>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+include <parameters.scad>
+include <components.scad>
+use <frames/pieces/box/front-or-back-windowed-forwardslashes.scad>
+
+module forwardslashes_windowed_front_or_back_box_frame_piece_for_extended_side() {
+	difference() {
+		forwardslashes_windowed_front_or_back_box_frame_piece();
+		// ...minus the frame wall and lip on the left
+		translate([-frame_x/2+frame_wall/2, 0, 0]) cube([frame_wall, frame_y, frame_z], center=true);
+	}
+}
+
+forwardslashes_windowed_front_or_back_box_frame_piece_for_extended_side();