A little overkill for fog lights, don't ya think?
QS192, the Through the Grill (TTG) lights shown are most correct for your 73 but, like that Lilac RS, you could do Driving Lights TTG and then Fog Lights off the spoiler. If you wanted to sick with a more rectangular light off the spoiler than round, maybe you'd like the early Hell 128s which have softer lines which might play well with the spoiler lines. Just a thought,,,