Question for the unmolested barn find truck owners

[c10chevy69]

I am hunting for the ground strap locations. I have found four of them. The two at the firewall to either side of the valve covers. The one from the inner fender to the frame on pass. side. The last one I found was the one from the cab to the cab mount pass. side about midway. Anybody willing to get dirty finding the last one or is there another one? The kits have five of them but I don't know. I would think that there is one under the bed somewhere that might be the place to start. If you would please post a pic of it's location and I will add mine and make a thread about it. Assembly manual only shows the engine locations (looked twice now). Thanks for your help.