this is the bolt that you are looking for. It just may be tapered on the bottom by rust. it is tapered underside of the head you mean
perhaps ask 60-66 if he could look up the part number or what it is called. gives no dother descrition in the assy manual about it
![](http://imagizer.imageshack.us/v2/1600x1200q90/924/fWIpyR.jpg)
ron