Bjorn, you forgot to mention that you don't actually have a top under there , , and that is why it fits perfectly...
lol, no I actually DO have one, heres 'proof' , one of the few pics of it up!....it just folds down very low, might also be part of a few reasons 1) I have a very thin top 2) it was/is a manual top with out the hold down clips as someone once made it 'power' 3) luck?