Getting ready to bolt up my flywheel, clutch and trans, but before that happens I would like to get something cleared up. IN Roger Williams book he mentions the top bolt in the rear main seal housing, he says it is a special bolt, but I dont see a special bolt listed with any of the suppliers. The bolt I did use was slightly shorter than the rest and I did use the copper washer with it. What is the special top bolt that Williams mentions and why do you even need to use a cooper washer?