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6mm threads, use a 10mm socket. They'll be called M6 acorn nuts. Use washers with them. I've been using stainless steel ones for years, they really bling up the valve cover. A GOOD hardware store should have them (ie, not home depot, although maybe).
Honestly, it scares me how much money you must have tied up in your car.I've been buying 14 of the OEM Volvo nuts once every year or so. 10 for cam Cover, 4 for license plate.
AAMOF I have a bag of them here on my computer desk...They come in a 10 pack... p/n 968458 Qty 10.
You change your nuts every year or so?
Best Performance thread ever
I've never had to use washers with OEM Volvo cam cover nuts. They also fit the License Plate studs as Redwood Chair stated. Why I use them. They stay shiny for a year or two.Be sure to use washers if you use oe license nuts as the threads are a little shorter & the acorn nut will jam on the stud before tightening the cover. Ask how I know that.