Had an engine code p0020 and an engine leak, took it to Firestone, they gave me a 1700 quote to replace the oil filter housing and one vvt. So I said bye. i wasn’t able to remove one of the screws bc it was free spinning. Pried it out only to find the ‘nut’ that the mounting screw goes in came out of the valve cover. I can’t get them apart. Can I order this insert separately and a set of mounting bolts? If so WHERE?!?