At the front of the grabrails, where the color changes from silver to the black piece the bags attach to, look straight down between the seat and grabrail. The upper bag support (where the latch grabs) even has a rounded recess molded into it for the bolt to come straight up. It is stainless steel with an Allen socket on top and has an unusually large washer under it. There are actually 2 bolts that secure the front end of the grabrail, it's the forward of the two I'm interested in, the rear isn't visible unless the seat is removed. I appreciate your help.