Thank you for replying Sabre-t, you represent the best part of this forum, your insight on using copper is brilliant and you were correct about not using nylon washers. Before I read your advise I went ahead and did the oil change with the nylon washers. Afterwards I parked my bike and within two days I found an oil drip on the floor. I then spent about $17 for a package of 100 - 12mm crush washers from Amazon and replaced the nylon washers. I now have enough crush washers to do oil changes for three life-times and an education to last me thru this one.I don't think I would use the nylon one. I just wouldn't trust it. I definitely would not use a copper one. There is a high potential for galvanic corrosion between aluminum and copper.
I hope this thread can help someone else down the road.