Since these come up quite often, I'll post what information I have here once and for all.

All data are taken from the Compur Repair Manual, so they should be correct.

There were five sizes of Compound shutter (late type, with X-sync):

Compound 3-X Tube 7
Compound 4-X Tube 9
Compound 4-X Tube 10/II
Compound 5-X Tube 12/I
Compound 5-X Tube 12/II

Dimensions are listed as:
A: Cell thread (all are the same front and rear), all are 40 t.p.i.
B: Flange thread
C: Largest aperture diameter
D: Body diameter
E: Length
F: Mount depth (flange to rear end of shutter).

Data - all dimensions in mm :

3-7 : A: 55.69 B: 60 x 29 1/13 t.p.i. C: 40 D: 87 E: 37 F: 15.7
4-9 : A: 62.20 B: 65.9 x 29 1/13 t.p.i. C: 52 D: 106 E: 50 F: 21.8
4-10/II : A: 67.92 B: 76.7 x 29 1/13 t.p.i. C: 52 D: 106 E: 45 F: 19.3
5-12/I : A: 82.77 B: M90 x 1mm C: 64.5 D: 125.5 E: 74 F: 33.2
5-12/II : A: 82.77 B: M90 x 1mm C: 64.5 D: 125.5 E: 60 F: 25.2

Fastest shutter speeds are: #3: 1/100 #4: 1/75 #5:1/50