Naw, its a little section of oak branch that was the right size, theres some other random debris cut to fit on the other side also, then theres a hole drilled in the middle of the I beam that I run a lag screw thru into the top of the log and it compresses the I-beam onto the spacers so they don't rattle loose. That I-beam is a bit too flexible to be supported just on the log ends, so I have to support it in the middle.
Yeah I probably will cut those pieces down to 8' length and square them up, my plan is to use them for workbench tops. I'll probably take off one more 5/4, then a 9/4, then mini-mill one side and finish taking off 5/4s. I wanted live edge on both sides of the central 9/4 piece, so I can't mini-mill it till that middle section comes off. I think I might try to make a coffee table out of the middle piece.