This Hammond choke is an ideal one to use in the MK-VII. It has a higher inductance value than the original choke, but the advantage of this is a much higher audio output in your headphones. It is the same one I used in my build. Look there how you can make this choke look old.
Inductance Henrys: 60
D.C. Current (ma.): 8
Resistance (Ohms): 2750
Max. Oper. Volts (D.C.): 400
Dimensions: 60.5 x 35.1 x 35.1 x 50.8 mm