Chrome Rocker bolt with UNF thread. Original Rocker cover bolts are dull zinc coated or painted but the chrome type look much better and cheaper.
A longer threaded version
CAM6823 was used on prestige Minifin alloy type A series rocker covers such as Vanden plas 1300 and MG Metros only to find themselves sought after for any under bonnet upgrade.
See also the
GMK039K chrome washer and
GM040K. Also see
SAC71L kit.