I am dismantling the bonnet on my USA LHD 1968 1.5 OTS, and I have two different styles of bumper blades. The left (drivers) blade bolts on from the outside (from below- female threads in bonnet) and the right blade bolts from inside the bonnet (female threads in the bumper). Which is correct for this model year (I know the bolt from the outside units are for later cars). Chassis 1E16060 if that helps. TIA!!