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You can use the same way here,except that the call will be to locate_template not the old function.

‘<?php locate_template( array( ‘optionsbar.php’ ), true ) /* Load the currently displayed object navigation */ ?>’

It is inside the conditional for your safety(you see it is in header.php by default and will appear on your site home page/other blog pages if you don’t put the conditional there).

If you want to use it in old way,just move the above section from header to your template file and It should work.