QUOTE(Vacca Rabite @ May 17 2010, 06:42 AM)
Mcmaster has many much variety of sealing crush washers. Just search for "Crush Washer" or "metric crush washer." You can choose either copper or aluminum.
http://www.mcmaster.com/#crush-washers/=74mkufIf you want the specific Porsche part, expect to pay the specific Porsche price. But, FYI, all the engine seal kits just come with the copper and aluminum variety, and they work great.
Zach
They also come with the asbestos filled variety, specifically to be used on the taco plate, the drain plug, the oil pressure relief plug(s), and the sump plate. I've recommended trying the dealer for hard to get parts countless times, but few people bother .........
The Cap'n