Part# GG-156A

Rubber body plug for 2-1/4" hole ID to 2-1/2" OD on portion that goes through the Sheetmetal - it has a taper to it so depending on how you measure - at the back of the taper it is 2-1/4" at the top it is 2-1/2" - used many times for the spare tire well trunk floor plugs...