I've noticed on a number of trucks made after mine (April '52) that the two slots in the seat base (passenger side facing the door) which hold the strap that holds the first aid kit are no longer there. But the rubber grommet holes are still there. So how do you hold the first aid kit to the side of the seat base in the newer trucks without any way to attach a strap to the base? Or was the first aid kit moved and stored someplace else? You can see what I'm talking about in the two pics below. The aqua seat base (mine) has the two slots in the indentation for the first aid kit, and the OD base does not. What gives?