If you are looking for a replacement isolator that we use in all of our rubber mount kits these are for you. They install into a 7/8" diameter hole usually in a tab thickness of 1/4". These isolators help reduce the harsh vibration felt by the sheetmetal parts that they hold in place, by redcuing the vibration felt by the part the longer your fluid container will live a crackfree life. These are commonly used for mounting gas tanks and oil tanks or any other fluid container that needs to be mounted.These are sold each.