there is a small plate that bolts onto the underneath of the ends of the beam
there is the big beam bolt that goes through themiddle, but there are 2 smaller bolts that hold it to the chassis

these are open to the elements so they can rust into the captive nuts welded to the chassis and then you might be a bit fucked trying to get them out

no bother getting new ones in again as you can get a new nut and bolt in there with a bit of spanner angling