6 Lowering Rear Coil Springs. GH9172 (#12 Reg B or Med Flat). Please wait for us to send you a combined invoice before paying. We are Gearhead Enterprises – a national street rod parts supply company. Parts are added to our store weekly so check often for the latest deals! Plus, we have access to thousands of parts that are not listed. We get hundreds of emails daily so at times it may take us up to 72 hours to respond to your emails. Auctiva Offers Free Image Hosting and Editing. Auctiva gets you noticed! Track Page Views With. Auctiva’s FREE Counter.