Check the listing for details. v iton INJECTOR ORING UPGRADE FORD 4.6 5.0 MUSTANG 5.8. Condition: New. Listed at 24.95 USD. This is a brown v iton injector oring upgrade kit for use with the Ford injectors from 85-95 and many other applications. These are for the injectors found on the 4.6 and 5.0 found in the Mustang as well as the 4.6,5.0 and 5.8 in the trucks.This size oring is also found in many other injector applications as well and is a common swap. With todays fuels containing 10-15% Ethanol and higher underhood temperatures the original Buna orings are prone to leak and deterioration. This kit includes the needed orings to correct these issues and while there is not a special oring made exclusively for ethanol the brown v iton has shown to have a better service life. Included in this kit are: [1] 16 brown v iton orings for the top and bottom of the injectors. Ninja Fuel Systems pn# 17006 Returns must be in the original shipping box and received by us undamaged to qualify for a refund. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov As of July 9th USPS has combined all non priority shipping including First Class into 1 service called Ground Advantage. Any listings that state we ship First Class will now be shipping Ground Advantage. Ebay is supposed to be updating this in the shipping section of the listing however to avoid any confusion if our description states First Class there is no more First Class available. They are telling us standard delivery times will stay between 3-5 to most locations as before however we have no control over these changes. Ebay will also be updating expected delivery dates if there are any changes there.