I’ve searched the forum thread for this but not finding what I need. OK having covered my ass there: the studs on this air cleaner (3/76 FJ40) are close to M6x1.0 but not exactly. It has a course thread. I was at Fastenal and they can‘t figure out what size they are either. Nothing he had in house. I’d like to have two of the wingnuts with washers that fit these but I can’t even find a nut that fits them. Can anyone tell me what size and tread pattern these are?