Just bought a 1978 Z28 two weeks ago. Went to do an oil change and nothing would remove the filter. Even the large screwdriver didn't work, tore the filter and bent the screwdriver....... Stripped the oil filter down to the mounting plate and had this tool made: Here it is in place on the oil filter base. Simply used socket and breaker bar to spin off the filter base: Another view of the tool in the filter base: For this oil filter 1/4" bolts fit in the oil filter base holes. Holes in the tool are 5/16" to give a little of bit of wiggle room to get the bolt spacing right. Hope this comes in handy for the absolute final solution to remove a stuck oil filter.