Here's a cross reference for CB series calipers that I transcribed from the Service Honda parts app. The calipers are listed by part name, part number and then model. Conceivably, each group of bikes (by part number) should have the same bleeder threads.
For example, a 10x 1.25mm fits bwaller's K3. According to the reference below, it would also fit CB750K0 - K5, 1976 CB750, and the CB450 K3 - K7 Super Sport.
Let me know if you think I've missed any CB models.
CALIPER A
45101-300-053
CB750K '76 750 Four K
CB450K3 - K7 Super Sport 450
CB750K0, CB750K1, CB750K2 FOUR
CB750K3 - K5 Four
45101-300-033
CB450K3 - K7 Super Sport 450
CB750K0, CB750K1, CB750K2 Four
45101-300-043
CB450K3 - K7 Super Sport 450
CB750K0, CB750K1, CB750K2 Four
45101-323-013
CB450K3 - K7 Super Sport 450
CB550K, CB550K1
CB360T, T '76
CB550F '76
CB550F '77
CB550K '77-'78
CB350G, CL350K5 Super Sport 350/Scrambler 350
CB350F, CB350F1
CB500, CB500K1, CB500K2 500 Four
CB360, CB 360G
CB500T, '76
CB400F '76 - '77 Super Sport 400 Four
43201-392-006
CB750F '76
45101-392-003
CB750F '76
CB750A '76
CB750A '77 - '78
CB750K '77 - '78
45101-413-003
CB400TI, CB400TII '78 - '79 Hawk I/II
CB400 A '78 Hawk Hondamatic
CM400A/T '79 - 81, CM400C '81 Hondamatic/Custom
CALIPER L
45101-410-006
CB750F '77 - '78
CALIPER R
45201-410-006
CB750F '77-'78
45201-442-701
CB750F '77 - '78
CALIPER R. FR.
45200-410-016
CB750F '77 - '78