[Boofo]

vb 4 does it differently. Try this in the parse_templates or process_templates_complete hook:

require_once(DIR . '/includes/class_template_parser.php');
$parser = new vB_TemplateParser('<a class="title');
$parser->dom_doc = new vB_DomDocument($parser->fetch_dom_compatible());
$find = trim($parser->_parse_nodes($parser->dom_doc->childNodes()));

$parser = new vB_TemplateParser('<a style="{vb:raw thread.vsa_tlmu_css}" class="title');
$parser->dom_doc = new vB_DomDocument($parser->fetch_dom_compatible());
$replace = trim($parser->_parse_nodes($parser->dom_doc->childNodes()));

$vbulletin->templatecache['threadbit'] = str_replace($find, $replace, $vbulletin->templatecache['threadbit']);
unset($find, $replace);