I've a 2002 4/4 with 1800 Zetec engine and use a 180mm long 3/8" drive spark plug socket produced by Koken. See https://www.ebay.co.uk/itm/Koken-16mm-Hex-180mm-Long-Spark-Plug-Socket-3-8-Sq/310321970005?hash=item4840a17b55:g:TWMAAMXQsmFRfqP9 . Its the perfect length to clear the cam cover while fitting beneath the bonnet. Also a very good quality tool.
Regards
Andy
