904/727 use the same as long as the one bolt hole is elongated... I swapped my Pro Trans brake from one to the other. My Griner is the same.
That said I’ve had great dealings with Dave and Darren at Pro Trans. Unfortunately they fled the people’s republic of CA for Texas last year. It was nice having them fairly close in Lancaster for sure. Their new number is 254-749-5689.
another good brake is the Griner which Keith Long at 727 Specialist now makes. He can be reached at 219-718-3542