Just got this email from McGard, after inquiring how many different combinations there are in their door hinge locks, leading me to believe the answer might well be "1":
Thank you for inquiring about the Hinge Locks. However since it is a security item, our privacy dictates us from indulging in how many different combinations we offer. If you were interested in ordering a lock set you can call Customer Service at 800-444-5847 Monday to Friday 8 to 5 Eastern Time. Thank you.