Holden 6cyl PCV Rocker Cover Breather Grommets Designed for all 6cyl: Holden HD HR HK HT HG HQ HJ HX HZ WB Torana LC LJ TA LH LX UC Commodore VB VC VH VK Will ONLY suit STANDARD Rocker covers Outside Diameter = aprox 30mm Inside Diameter = aprox 19mm Height = aprox 25mm This is for a pair of beautifully made rocker cover grommets. These fit into your rocker cover to hold the PCV value and breather elbow. Our grommets have a high neoprene content to greatly improve oil and heat resistance. Most cheapies don t have this additive and will start to deteriorate and look crappy when in contact with oil and heat. Thanks for looking and don't forget to check out all of our Restoration Essentials in our store. All postal deliveries are with Aust Post eParcel with a unique Tracking number. Your parcel's tracking number will be sent to you via email on dispatch so you can keep an eye on your delivery.