Fan and Power Steering belts
I just replaced the belts on my '74 318. They are goodyear gatorbacks:
-15440
-15461
Im just not sure how different a '67 273 would be from my engine. Before I installed these belts I used Dayco Top Cogs:
-15430
-15460
Either way it's probably close to these numbers. Hope this helps.
Those fit as well.