Ya that's a 73 up B body pin type caliper.
If you stay with the pin type, you need 70-74 E body calipers. (70-72 B are the same, too)
If you have the calipers mounted towards the Front, the B & E body flex hoses work.
If you have calipers towards the Rear, i can't give you a hose recommendation, as i don't know, what they use for rear mounted calipers.
Good luck.