Index: wp-admin/css/wp-admin-rtl.css
===================================================================
--- wp-admin/css/wp-admin-rtl.css	(revision 22639)
+++ wp-admin/css/wp-admin-rtl.css	(working copy)
@@ -1350,6 +1350,15 @@
 	font-family: Tahoma, Arial, sans-serif;
 }
 
+.options-permalink-php #custom-structure td {
+	direction: ltr;
+	float: right;
+}
+
+.options-permalink-php code {
+	unicode-bidi: embed;
+}
+
 /*------------------------------------------------------------------------------
   21.0 - Admin Footer
 ------------------------------------------------------------------------------*/
Index: wp-admin/options-permalink.php
===================================================================
--- wp-admin/options-permalink.php	(revision 22639)
+++ wp-admin/options-permalink.php	(working copy)
@@ -210,7 +210,7 @@
 		<th><label><input name="selection" type="radio" value="<?php echo esc_attr($structures[4]); ?>" <?php checked($structures[4], $permalink_structure); ?> /> <?php _e('Post name'); ?></label></th>
 		<td><code><?php echo get_option('home') . $blog_prefix . $prefix . '/' . _x( 'sample-post', 'sample permalink structure' ) . '/'; ?></code></td>
 	</tr>
-	<tr>
+	<tr id="custom-structure">
 		<th>
 			<label><input name="selection" id="custom_selection" type="radio" value="custom" <?php checked( !in_array($permalink_structure, $structures) ); ?> />
 			<?php _e('Custom Structure'); ?>