When my cousin Matt decided to have me help him convert his '74 tii to '73 US bumpers we decided that since he was going to have his car painted anyway that we should have the body guy/painter modify the nose skin for mounting of the '73 style bumper brackets. He chose '73 brackets so that he would have a little bit of protection, not allot but some.
It worked out very well, and looks correct as if it really was a euro car but with '73 US brackets. We borrowed a friends '73 tii to take measurements from for the slots in the front and all other holes including the holes in the front frame rails.
The front bumper on pre '74 '02s doesn't line up square with the lower molding but a bit below, where as the rear bumper lines up with the molding.
For some good inspiration on fitting the front bumper check out Stella..
http://my2002tii.com/mar2003/marchpart2.htm
As for Matt's tii here's the progression...
Before
Delivering to the Body Guy
New Arktis Blau met. paint
Finished
He took about a year to make his final decision, attending many '02 gatherings, seeing many different variations of bumper conversions. Finally he decided that since he was going to have the car painted anyway that he chose to go the FULL euro look, Italian turnsignals euro headlights, shaved side markers and all, well except for the '73 bumper brackets.