The first problem is that i have an oil leak, am I correct in thinking this is the gear linkage oil seal?

I have also noticed that there is oil on the the sump, could this indicate that the problem is higher up and is driping down i.e. rocker cover gasket.
My other problem is that i cannot remove my front grill, i have undone the screws along the top and sides but the bottom seems to be rivited on is this normal or are there hidden screws?
Thanks for any help
Rob