thanks Peter,
The bolts I'm refering to appear to be "factory" installed and not anything to do with mounting. The sub-frame hooks over the very front of the tractor frame and a pin holds the back end up - doesn't look like any adjustment there. When I installed the subframe, it appeared to be straight, but I didn't have a real close look. My FEL is uneven as well, same side, same amount - I can't help but think there is a connection here?