Gerahead's 71 Dart

You may recall that the disassembly of this car was started by the previous owner. Now that I can rotate the car and actuall see what is under it, I found these two bolts and don't know what they would have held in............This is the bottom (ground) side of the driver's side front frame rail. The big bolt heads are for the K-member, what are the two little bolts for????? There are no bolt holes like it on the passenger side. Thanks. L8r

Jim